Some calculations from:
“A pilot phase-II prospective study to test the ‘efficacy’ and tolerability of a penile-extender device in the treatment of ‘short penis’”. British Journal of Urology.”
Month 1 Month 2 Month 3 Month 4 Month 5 Month 6
Force 1.32 1.98 2.20 2.42 2.6 2.6
Time 150 150 150 140 130 120
Sub-Total 200 300 330 360 340 310
Total 200 500 880 1240 1580 1890
Force is in pounds (converted from grams).
Time is in hours.
Notes:
The fastest gains were seen in the first month (so we will disregard the first month as newbie gains), and were about as much as was gained in months 2-6.
Use of the device decreased as time went on, from an average of 5 hours/day to 4hours/day.
Calculations:
Month 2-6 =
~1700 pound*hours
Or 11.33 pound*hours per day for 150 days for a gain of 0.32 inches
5312 pound*hours (or 318720 pound minutes) to gain 1”.
Which would be 873 pound minutes*365 days. So we need to hand 873 pound minutes to gain 1” in a year according to this study.
Which is equivalent to hanging 10lbs for 90 minutes, or 6 15 minute sessions everyday.