Multitasking Usually Makes Homework Take Longer

Media multitasking means using two or more forms of media at the same time. A review found that it interfered with attention, memory, learning, and efficiency during studying^[1].

The student above is not fully attending to three things at once. Each phone check replaces the assignment with a different task. Returning to the assignment creates another switch.

That distinction matters. A message may take only a few seconds to read. However, the interruption includes leaving the assignment, reading the message, deciding whether to answer, and returning. The visible phone time is not the whole cost.

The same review connected media multitasking with weaker recall, reading, note-taking, test performance, and self-control^[1]. This means the possible cost is not limited to finishing later. A student may also remember less from the time they spent.

Across six experiments, participants switched between simple classification tasks on a predictable schedule. Their first response after each switch was slower^[2].

Extra preparation reduced part of that slowdown. Yet a large delay remained on the first response after switching, even with 1.2 seconds to prepare^[2]. These were simple laboratory tasks, not homework. Still, they demonstrate that a planned switch can carry a time cost.

A separate online experiment included 5,271 people aged 10 to 66. Switching blocks were slower than blocks containing only one task^[3]. The slowdown on the switch itself was fairly stable across the ages studied^[3]. That makes the result relevant to teenagers, although the task was not schoolwork.

A single interruption will not necessarily ruin an evening. The problem is repetition. Checking a chat, returning, opening a video, and returning again creates a chain of switches. Each one offers another chance to lose time.

The feeling of being busy can be misleading. You may answer messages, watch clips, and complete parts of an assignment. Because several things move forward, the evening can feel productive.

However, the review found that students struggled to judge how media multitasking affected their academic performance^[1]. Feeling comfortable with switching does not confirm that it is harmless.

Short videos create another practical problem. They rarely arrive alone. Watching one clip can turn into a longer viewing session. That extra viewing time is separate from the cost of switching. You lose both the minutes spent watching and the time needed to return to the assignment.

You do not need to decide whether you are “good at multitasking.” A simpler test is whether your assignment moves forward faster when competing media are unavailable.

One study examined 977 students aged 11 to 18. More media multitasking during homework went with lower marks and more reported problems controlling and organizing thought^[4].

Within a smaller group of 114 students, heavier multitasking also went with weaker working memory and slower mental processing^[4]. Working memory is the limited mental space that holds information while you use it.

Another study included 637 high-school students. More social media multitasking went with weaker control of attention and poorer academic performance^[5]. The study measured links between these factors. It cannot prove that multitasking alone caused the lower performance^[5].

These adolescent studies help connect the issue to real homework habits. However, they did not directly measure how many extra minutes an assignment required^[4][5]. The time question is supported more indirectly through findings about switching and efficiency.

One workable routine is to protect a short block from preventable switching. Suppose you begin at 7:00. Decide what you want to finish before opening the assignment. Then remove the easiest routes into chat and video feeds.

Twenty-five minutes is a practical starting point, not a magic number. Make the block shorter if that helps you begin. Make it longer if you are working steadily. The key is that messages and videos wait until the planned stopping point.

Use this routine today:

1. Choose one clear target. Write down what you intend to complete during this block.
2. Move the phone out of reach. Put it in another room, a bag, or with a family member. This follows findings that mobile media can distract and reduce efficiency^[1][6].
3. Close unrelated tabs. Keep only the material needed for the assignment visible.
4. Park distracting thoughts. If you remember a message or video, write a short reminder instead of checking immediately.
5. Check deliberately after the block. Set a stopping point, save your work, and then decide whether to open the chat.

Tell close friends when you will check messages again. If your family may need you urgently, allow calls from selected contacts. The aim is not to disappear. It is to decide when switching happens.

Learn4Less sessions can use the same single-task routine: one planned work block, followed by a deliberate message check.

The studies here do not provide one universal number of minutes lost to multitasking^{[1][2][4][5][3]}. Assignment difficulty, the interruption, and the student may all matter.

The switching experiments did not use homework assignments^[2][3]. The adolescent studies found that multitasking and poorer performance went together, but they cannot establish one-way cause by themselves^[4][5]. The review also called for work across a wider range of school tasks and settings^[1].

Not every measure becomes worse after every interruption. Across three experiments with 179 younger and older adults, emotional interruptions delayed their return. Yet accuracy was higher afterward, and some groups worked faster in certain conditions^[7]. Those findings came from assigned tasks, not homework with group chats.

So the strongest practical claim is limited. Frequent switching usually reduces efficiency, but the exact cost will vary. These sources cannot tell you precisely how long tonight’s assignment will take.

Choose two similar homework evenings. On the first evening, keep your usual setup. Record when you start, when you finish, and how often you check another app.

On the second evening, place your phone outside reach. Work through one protected block before checking anything. Record the same details. This is not a perfect experiment, since the assignments may differ. It can still reveal whether your current routine is costing you noticeable time.

If you change only one thing, change the phone’s location. Silencing it while it remains beside you still leaves every app within reach. Putting it elsewhere adds a pause between the urge and the switch. That pause gives you a chance to finish the block first.