TheLabGuy
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I do tons of bridges (at least working on one almost everyday) and I can't think of the last time I've had a bridge rock. Are you using dipping wax then inlay wax? Waxing the margins under a scope or at least double checking under a scope? To answer your question, a 3-unit takes me about 25 minutes to have waxed up and in the ringless sprue-former ready for investment. I never wait like you are doing.....don't have the time, get'em in, make them beautiful and get'em out.