Fewer than one in ten. That is how often AI takes over a whole task from start to finish, according to a July 2026 survey of 1,106 employed Americans run by Epoch AI. In most cases, it handles a piece of the job and a person handles the rest. That is easy to miss, because the usual conversation is about whether AI can do a task. The more useful question is which part of the task it should do. The same survey found that when AI did most or all of a task, people reported saving time 53% of the time. And roughly one in six AI-assisted tasks took longer than before. That is a time issue because the gap between those two results is not about the tool. It is about where we cut the task. A well-chosen slice gives back minutes at the start of the job. A badly chosen slice quietly adds minutes of checking, stitching and rework at the end. ------------- Context ------------- Most of us still describe our work in whole tasks. Write the proposal. Prepare the report. Answer the enquiry. Plan the event. When AI arrives, we tend to hand over the whole label and see what comes back, because the label is how the work sits in our heads and on our to-do lists. The trouble is that a whole task is rarely one kind of work. A client proposal holds research, structure, pricing judgement, wording, formatting and a final read for tone. Some of those pieces are easy to describe and easy to check. Others depend on things only we know, like how this particular client reacts to a number. When we hand over the whole label, the machine does a bit of everything and nothing completely. We then spend time working out which parts to trust. That sorting is the hidden cost. It is invisible work, because it never appears on the list, and it is a likely reason why one in six tasks ends up slower. The better framing is the slice. A slice is a piece of a task with clear edges: we can say what goes in, what should come out, and how we will know it is right in under two minutes. Research summaries, first-pass outlines, tidy-ups of rough notes and reformatting all tend to make good slices. Pricing decisions and tone calls usually do not.