It's not logical, nope. Chance is counted when the process is started (at least I've been told that many years ago, IC by Conservator). But even 148 hours is not enough to "earn" 3% base chance. There is something else, and I think (again) know what! In other words, it's not enough to live for 350+ hours and you'll chance will be 90% (see Saam's timeline).