IFR to & from CLT - Delays and Fees to Expect

I'm considering flying from ROA to CLT for a business meeting at the
airport itself next Tuesday -- arriving around noon and departing
around 16:00. I've not flown G/A to CLT before -- anyone able to
advise on the in/out delays (and fees) that I should expect? I'm
having a tough time justifying the 1:15 in the air "best case" vs. 3
hours driving point-to-point.

I just flew to BWI yesterday, and as always it was quick in and out --
also have had similar (good) mid-day experiences at PHL -- but maybe
I'm spoiled by those!

Thanks,
Dave