There are two things you can do to speed up the carving times. One is increasing your feed rate on the finishing pass since you are removing only a small amount of material. I use a feed rate of 80 ipm, but you may not achieve that due to all of the z-axis movement.
The second is to change the stepover value for your tapered ballnose bit from 4% to a value between 6-8%. This will impact the carving times dramatically. The vectric experts recommend values between 6% and 8% for exactly this reason.
The estimated carving times in Aspire depend a lot on the settings for the “Rapid Rate” and the “Scale Factor”. My scale factor is around 2.0 for 3D carving and 1.0 for 2D carving. You will need to adjust these values after running a few projects to improve your estimates.