Is 13-15 minutes of average playtime good for my upcoming simulator?
Average play time isn’t a valuable enough statistic for what you’re looking for. Focus on engagement and retention!
It kind of depends on if the game is actually good and brings back players to play more, as also said by @iGottic. Simulator games, such as your own, might bring the younger demographic (e.g. 8, 9, 10, 11, maybe 12) but push away more older audiences as P2W games are quite repetitive nowadays (though, I’m trying my best not to give my opinion).
I’d expect maybe a 5-10 minute retention time for players as its just a simulator and nothing more.
You must not have enough players then