25x physical timewarp is too slow when it comes to constant burning trip. Today I spent 13 real hours in SFS waiting to finish a fuel burn going at 25x timewarp, could you increase it to 50,000x, for example? I would recommend setting this multiplier only at a certain altitude (Like KSP does) and removing various physics such as aerodynamics, stages, only leaving the essentials (running engines and rotating the ship)