I find that my patterns of productivity when varies a lot when coding. Occasionally I get in 'the zone' where I have laser like focus and can knock out hundreds of lines of code in a night. Other days, I have no inspiration and write next to nothing.
Can you clarify how you would measure a percentage of a day (are you referring to a 24 hour period or the awake hours)? I think a more sensible metric would be to ask how many hours per day on average does a technical founder spend coding.
Averaged out in the first few months, it must be around 40-50% of my day. (~5-6 hours max).
I find it hard to believe that anybody could clock more than 70-80% sustained for more than a week. With 8 hours of sleep a day, you would get 16 hours of potentially productive time. 80% would equate to ~13 hours of coding leaving you with 3 hours for meals and general 'life admin'. That's not much.
