You're asking two separate questions here. Try not to merge them into one. Try this.

During your start-up phase, on average, how many hours a day do you spend on:

a. Coding

b. Non-coding activities (related to your start-up)

That way you can deduce total hours spent (on average per day) on the start-up.

Also it would be useful for you to ask how long the 'start-up' period lasted.