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It depends on the protein that you are folding and the processor that it is folding on. Some proteins complete more quickly than others. Also it depends on whether you are using an AMD or an Intel chip and the clock speed of the cpu. There is a long thread with comparisons of different cpu's/proteins listed and it may help you to discover how well your system is doing. It sounds like it's probably doing what it can and should be alright.
It depends on the protien your folding. with my main system I could fold a frame any where between 1.5 to 10 min per a frame. to give you a better reference a gnra hairpin best time of 3.86 min. per a frame with my tbird.