I originally ordered a size too small (my first stealth product) and went all in with premium sleeves and corkscrew, so I ended up having to get a larger inner wear shortly there after, but was still able to use the smaller corkscrew size.
I wear my innerwear and corkscrew anywhere from 8-12 hours a day, 7 days a week (with the occational day off every now and then). I got my corkscrew at the very beginning of February this year. Took me about a month of trial-and-error to figure out how to wear it comfortably (avoid circulation strangulation at the glands, skin burn, etc.).
I measured my bone-pressed stretched length (no to be confused with the length measuring for a steath innerwear) and my max stretch was around 7.25″ – 7.5″ depending on how loose my ligaments are at the beginning of the year. Now I’m able to get a good 8.0″ stretch. That’s about 2 months of consistent use.
I hope to get a month or so more in using the current corkscrew size until I need to order my next size so I can press on into 8.25″ stretched length territory. I figure the E26 corkscrew will carry me into next year.
Of course everyone is different and mileage may vary.