how many days would it take for each of them to finish a route?
Idk at the 100% if this is what you want but, here is what i got :P (all of this is Unofficial so, please do not make any expectations, i'm just speculating here)
•Gran would take 2040-6209 days (5 -17 years)
•Dave would take 2280-6939 days (6 -19 years)
•Norman would take 2520-7669 days (7-21 years)
•Pierre would take 2880-8519 days (8-23 years)
And
•Roderick (the Best boy ever) would take 3220-9129 days (9-25 years)
Yeah, that's a LOT, but, hey that's unlikely to happen and surely, the build 1.14 (maybe) will be relased in 117 days :J
If you were asking, i made my calculations with the amount of time between each build:
Minimum amount of days/years; when each build was releasing every 3 months (1.06, 1.07 and 1.08)
Maximum amount of days/years ; with the period of time between Dave's day 2 and Norman's day 2 (1.12 & 1.13)
If someone can make something more accurate, please write it down bellow
(Oh and if you were referring to the days in game for a route to end, it's 6 days each i think, for the whole halloween foreshadowing, so, Gran, Dave & Norman had 4 days left and Pierre & Roderick had 5 days left)
Thanks for reading and i hope that all of this yapping answered your question, stay safe pal :D