I would say 12-14 if motoring at hull speed the whole time, using the inside passage part. Took me 10 hrs with a 1 hour stop at LaConner for a late lunch from Edmonds at 6 knots. I doubt a C25 can go 6 knots, probably 5, so even my 12-14 might be on the hopeful side from Seattle proper. That is 2 of not 3 to Edmonds. I can see this being a 2 day trip, or one really long one!
She drives me boat,
I drives me dinghy!