Here is something that will stop the turtle!! This works quite well as a very stealthy all day stretcher, and it is virtually free. Just cut a strip out of an old t-shirt or soft cloth about 12-15 inches long and about an inch wide. If you use t-shirt material, it will roll up lengthwise so you don’t have to fold it, and it will stay that way. With your dick at about 60 or 70% hard, put the string under your balls, and hold both ends of the string up where they are about even. Wrap one end and then the other around your whole package a couple of times, ending with the ends of the string back on top of your dick. Then do an overhand knot, but leave one end of the string sticking out instead of pulling it all the way through. That way, it’s a simple slip-knot, which can be undone with one quick pull.
I’ve found this to be a very effective all day stretcher. It keeps your dick at full size, and can be worn for two or three hours at a time. Just be sure to check often to make sure the glans is not feeling cold. If it is, remove the string and massage to get circulation going.