Consider aspects related to:
How many month(s)/week(s)/day(s)/hour(s) do you want to work?
Another way to look at it - what months(s)/week(s)/day(s)/hour(s) do you NOT want to work? (Time spent with family, vacation, hobbies, etc.)
What do you want you work to look like?
What - if any - interaction with customer(s) would you like?
How much money do you want/need to make...
To fund the business?
To pay yourself enough to give the business the time & energy it needs from you?
To (sustainably) grow as much as you'd like it to?