hang in there rdwhahb. just brew with it it wont be ruined. 45 minutes is a decent amount of conversion. once the temperature went up though,the protien enzymes unwind (denature) and are useless, so you won't get any benefit from waiting around. you will still get plenty of sugar out of your mash, just a lower efficiency. and my bet is it turns out okay. if your initial gravity is a little low i suppose you could add some dme,lme, etc.