I am looking at a boat with a bravo 1 with 625 hp wondering how it has held up and how much longer it could? he said its been fine but hes not hard on it, whats that mean ans what would i have to do to make it last. thanks

Depends on several factors. Weight of the boat, how it was driven, how often the lube was changed, how the drive was shimmed, etc.

I've seen plenty of stock Bravos last years behind 600+hp and I have seen other fail within hours behind 500hp.

It's a 93 fountain 27 foot. Said he has 100 hrs on current setup but isn't hard on it. 400 hrs total