Realistic hours
The hours you are at your desk and the hours a client pays for are two different numbers. For most freelancers the second one lands between 20 and 30 a week, not 40. Here is why, and how to plan a day around the real figure.
The short answer
Forty hours at your desk do not turn into forty hours on an invoice. Quoting, email, admin, the call that becomes three calls: none of it bills, and all of it takes real time. What is left, the focused work a client actually pays for, is usually 20 to 30 hours. Treat that as your planning number, not the 40 on paper.
20-30h
A realistic billable week for many solo freelancers on a standard 40 desk hours. Yours may sit higher or lower; the gap is the point.
The math
Start with a full week: five days of eight hours. That is 40 hours of being at work. Now take out the parts of the job that keep the business running but never reach an invoice.
A rough breakdown most freelancers recognise: an hour a day on email and messages, a few hours a week quoting and chasing new work, an hour or two on invoicing and admin, and the slow tax of switching between clients and contexts. Add it up and ten to twenty hours are gone before any client work happens.
What remains is your billable capacity. On a calm week it might be 30 hours. On a week heavy with sales or admin it can drop under 20. Neither is a failure. It is the real shape of solo work, and planning against the 40 you wrote down is how you end up overbooked.
Planning against it
You do not hit a realistic week by tracking it after the fact. You hit it by planning each day against the hours you actually have, and stopping before the day tips over. That is what the capacity bar is for: size each task, set the real hours for the day, and watch the bar fill. When it turns red while you are still planning, that is your cue to move something, not a verdict at 5pm.
Honest answers
Start free, size a real day, and watch the capacity bar. You will see the gap between your desk hours and your billable ones in about five minutes.