When You Fly Long Routes...

Hello everyone!
I have a quick question for all FSX players who do long flights. Do you fly the flight at normal speed the whole time through or do you speed up the simulation rate? If you do speed up the simulation rate then how do you respond to ATC when they check in on you?
I have a quick question for all FSX players who do long flights. Do you fly the flight at normal speed the whole time through or do you speed up the simulation rate? If you do speed up the simulation rate then how do you respond to ATC when they check in on you?