How to use the online timer
An hour is the natural unit of the office day, and an office hour is rarely uninterrupted, which is precisely why it needs a shape. Between messages, questions across the desk and a calendar that fills itself, an hour of unclaimed time tends to evaporate into small tasks that were not important. Naming what the hour is for, before it starts, is the difference between an hour spent and an hour used.
Batching is what makes the rest of the day work around it. Answering messages at two or three fixed points rather than as they arrive keeps the hour intact and costs far less than the constant switching it replaces, and most things marked urgent survive fifty minutes without anyone noticing. Working from home changes the interruptions rather than removing them, since the doorbell and the washing machine are simply different colleagues.
Put the hour that needs thinking where your attention actually is, which for most people is the morning rather than the stretch after lunch. Leave the administrative work, the expenses and the tidying of files for the flatter part of the afternoon, when it does not much matter that concentration has gone. Stopping at the end, rather than sliding into the next hour, is what keeps the day from becoming one shapeless block.
Common questions
How do I stop messages eating the hour?
Answer them at two or three fixed points in the day rather than as they arrive. Most things marked urgent survive fifty minutes without anyone noticing.
When should I schedule demanding work?
Where your attention actually is, which for most people is the morning. Leave admin, expenses and filing for the flatter part of the afternoon when it matters less that focus has gone.