Average sized hands, or even slightly less than average for a male of 6' height.
My limbs, for my height, are above average length in proportion to the torso (leads people to have the impression I am one or more inches taller than I am.) My hands are of a similar disposition as to relative proportions.
Fingers: long, 'medium thinnish.' Middle (piano '3rd) finger from the first knuckle on the hand to the fingertip is a little over four and a half inches. The length from the tip of the thumb to the first knuckle is one and a half inches (a literally handy measuring tool, on board

On the standard keyboard, I have no trouble reaching a 10th, and if there is enough prep time, I can manage some elevenths.
But-- curse and blessing. sometimes when playing I have to learn how to keep some of the finger(s) more out of the way than a slightly more 'average' hand with a 'tidier bundle' of fingers.
Bach had short stubby fingers, albeit his keyboards had slightly narrower keys ;-) I believe Gilels also had fat hands, short 'sausage-like' fingers.
Roger Muraro, pianist, is a very large man whose hands are so large, fingers thick (all proportionate to look at) that he has to use a lot of axial rotation to not only drop a finger onto a white key between two black keys, but if he did not, the finger would 'jam' slightly into the space between those two keys. His hand size has not kept him from being a renowned interpreter / performer of Liszt and Messiaen.
Piano, fiddle, other stringed instruments, there is little cause for envy or worry unless the hands / fingers are exceptionally small or short. A friend / colleague of mine, now adult, was a child prodigy violinist. She now holds posts in several chamber orchestra as well as doing the occasional additional chamber music or solo gig. At full adult height, she is well under five feet, nearly doll-like, and with tiny hands: she will never be able to reach or negotiate the double stops in the Prokofiev second concerto, though otherwise the work is well within her musical and technical arsenal.
Ditto for the exceptionally small handed pianist, and a good deal of the body of literature from Beethoven and later.
The late great Alicia Delarrocha had tiny hands. An interviewer mentioned the size of her hands and asked her if she had to come up with very different fingerings in order to play much of the repertoire. Ms. Delarrocha actually giggled when she responded, and said, "Oh, yes, I must come up with all sorts of crazy fingerings because of the size of my hands."
Our 'organically attached tools' come in a vast array of sizes and shapes, yet of that myriad variety, most of them, mind put to task 'at hand' can negotiate whatever is needed.