That’s easy, whenever the deadline is. I can do a 3 week job in 2 weeks or a 2 week job in 4 weeks,
just depends on the deadline for me. LOL
Joking aside, my jobs are usually big enough that instead of figuring hours, I figure days, or sometimes even by the week. My wife tells me it always takes longer as well, huh, what does she know? (but she’s usually right) :)

Figuring out how to do something you have never done is what makes a good challenge.