At 5'7 mine used to be 25inches but was uncomfortable for many reasons.
1 have no hair on the insides of my legs
2.biking would chafe the area under my balls and fuck did that hurt!!
Got so bad I would have to run vasiline in that area.
3.could not run-was cut for A baseball team beacause I lost speed they were so big
Loved training legs though
Extensions------Leg curls-----Leg press
50-15 reps... 40-15reps ... 3plates a side-15 .. . Squats
60-15 ... 50-15 ... 5 - 15 ... 135-15...
70-12 ... 60-12 ... 7-12 ... 225-15...
80-10-12 .. 70-8-11reps .. 8-10-12 ... 275-12...
90-7-10 ... 80-5-8 9-8to10reps ... 315-7-11...
10-4-7 ... 335-4-8...
11-2-4 ...
Damn I must be bored but that what I used to do about 12 yrs ago before my back went but just loved pushing my legs to the max!
In fact I did this same routine and felt incredible one day,workout almost the same and squatted 365 or 5..tore my hamstring..then did one more for an even 6!!
I miss being young you heal so much faster

Gotta repost Tom Platz..I don't even think today anyone comes close to his legs!!