100 ish hours
first playtrough 40-50 hours exploring most of it, tanking with high end powerarmour 50-something levels at the end - institute ending
second playtrough 20-25 hours, "speed" running, lightarmour mysterious liquid, chem run 20-something levels at the end - railroad ending
rest of the time i spent loving around with console best gear all legendary, all perks - no ending