Well, 2 months is a good long time, and 15 travel days are a lot - I wouldn't feel obliged to use all 15 days if I found places I liked and wanted to linger a while longer. Generally, I'll give most large cities a minimum of 3 days. I prefer 5, just to feel like i've REALLY spent some time there - so with 15 travel days out of 60 total, you'll be able to do that pretty easily.
As for where to hit, that's a toughie - what time of year are you going and what do you want to do? You can hit every party spot on route and have a tour of destruction, or you can visit the most historical places, etc. etc...
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