All relative.
- How proficient you are
- What procedures are you following (real world checklists, real carrier SOP, etc…)
- Are you using ATC (sim VS VVATSIM where you need to get clearances and are waiting on controllers dealing with other aircraft)
I follow real world ops / SOP’s and checklists to a T. (including doing a walk around) and only fly on VATSIM. So when learning a new aircraft, the cold and dark to takeoff can take me a long time as I familiarize myself with the aircraft.
As I get more hours on it, I can do it a relatively short amount of time.
Airliners are more or less the same in terms of startup procedures, what has to go first, etc… Of course there are differences between aircraft and their variants, it’s more less the same.
Just a matter of learning where everything is, the correct order, the values to watch for during startup, etc…
In the CRJ and Fenix A320 from cold and dark to take off clearance. About 40 minutes.
Again, I follow all the real procedures, use GSX in real time, etc…