I've built cars in 2 hours,,and i have some i been working on for 6 mos now,, Depends on what your doing, and if it makes you happy. I have a motor setting there that has over 12 hrs on it.
Do what makes you happy,,But the more time you spend detailing each and every part, the better it will look..Spend time
looking up pictures of that vechile,,and try to make your match, wiring, brake lines, heater hoses, etc, etc,,
*** When i was young,, I was a Rabbit,, But now I'm OLD,,i find Slow can be a lot more FUN.******