Buckin' Billy Ray Smith talks about that on his YouTube channel... I find a 25" bar on my 461 works well for my height and arm length... I can buck logs on the ground without bending over by bending my knees a bit. I suspect a 28" bar may be in my future as I start aging out and the knees cannot take it.
As an aside, Buckin' reminds me very much of my next door neighbor when I was a kid. About 58 years ago he bought my grandparents' house. Now 82 he's in the process of moving into an assisted living facility... He heated with wood and in recent years I gave him wood, and bucked and noodled tree service logs for him that were too big for his saw. He hand split his firewood up until 2 years ago!
I've had that bar length conversation with a lot of people over the years as I'm often in the shop where my son sells Stihl and Husky saws (among other things). When I see a young guy 6' 2"+ picking out a dainty little saw with a short bar to clear the new property he bought I feel compelled to chat with him. Some get it... but most come across as afraid to use the saw let alone a long bar. I universally recommend PPE and training...