I can't imagine going out with just one battery for my DJI Mini 2, especially it lasts ~15-20 minutes on a good and warm day. The wind and air temperature will play a lot in for how long how your battery will last when you're actually out and about.
If I'm flying against the wind, I can get away with turning around at around 40% to get the drone back, as the wind will be behind the drone on the return journey, the amount of power needed to get back will be much reduced. Just remember that if you're flying against the wind at the start of the journey, you'll need about twice as much battery to get home, if not more. Practice and experience will soon teach you.
Thanks, I always remember returning to home about 30% with the mavic but never really took it that far anyway.
Might have to pick up the fly more version then. Not sure how much use I'll get out of a mini but do regret selling the mavic sometimes