How long did the SR-71 take to get to cruising altitude?
According to the performance data in the manual it takes 19.9 minutes to get to 70,600 feet. 

 

Refueling time will depend on how much fuel is needed for the mission as well as how long it takes to hook up to the tanker. The manual covers the operations for that but  I dont see a flow rate of fuel in there. A lot of that stuff is covered in this podcast.