If hunting Tajikistan in the Pamirs it is 20 hours on some shitty roads. I had a buddy do this trip last year and said it is by far the worst part of the trip. There is another range in Tajikistan which is Bucharan (check my spelling) but it is 6 to 7 hours, not as high elevation but steeper and has smaller ibex on average (you are talking like 2 inches)
Kyrgyzstan varies - heard 6 to 12 hours depending on the area. I have heard talk of premier areas but not sure how accurate it is.
Your flights are spot on. 10 hours to Istanbul (11 coming back) and 5 hours to Tajikistan, Kyrgyzstan or Kazakhstan...Mongolia is about 8.