I was led to believe that it typically takes around 20 hours, give or take, to break in new speakers. I've had my Germino Club 40 head and straight 4x12 (Greenbacks) since October '09. I was jamming away through it the other night, and I swear it sounded better than it ever has, and it's always sounded stellar! The feel of the amp just seemed to loosen a bit. It might be in my head, I don't know. The amp has a real quick attack even in tube rectifier mode (I keep mine on the tube rectifier) but, again, it just seemed to have a little extra sauce the other night. I have no idea how many hours are on the speakers, but it's not near as many as you might think as it doesn't get gigged very much and shares time with my other amps. If I had to guess, I'd say it might have 50 hours of playing time, max. I would think even with that low amount of hours, I'd think the speakers would've been broken is sooner.