ATC IFR Rejection - FSX?

ATC will cancel your IFR flight plan if you do not answer their instructions... They will ask you if you "heard" their last transmission... But after a while they will just cancel the flight plan.... Having the simulator on time acceleration speeds up that process... Next time ATC asks you to do something, be it change frequencies or headings or altitudes or what not... Slow down the time acceleration, answer their request, then you can speed up time acceleration again. However, if your reaction time is fast enough, you can still answer them while on 16x acceleration... It just takes practice.