once i feel cold or numbness it is time for me to take it off..usually happens around the 1hr mark...you don't want to do any damage for the sake of a few extra minutes in the extender.
when my head gets cold in the extender i just squeeze the blood out of the head with my hand and then do a few kegels to get more blood back into it then squeeze it again and carry on with the extender session.
What extender do u use?That's important...be sure that is some good extender.Good quality...Fs,anro-penis,fast-size e.t.c.As soon as u do that breaks(after 1,2 hours it is safe)and u do after 15 minutes.Maybe u give very strong strech.Read the manuel and listen the manuel.If this is the problem take off 1,2 roads...if it is not than watch your penis.I think that u should put away immedialty if u see some discoloration,like your glans becoming blue.Just keep going.It is normal for your glans to become cold and also try dividing the session 3 hours morning....3 hours afternoon maybe...3 hours at evening...I think this will help.All good
There's no harm in removing your extender if your penis is cold. A solution would be to get enough padding to allow circulation and to ensure a better grip on the strap/noose. A silicone gel padding seems to work best in that capacity.
2thing you can have it on semi errect but on low-mild tenstion
or you can have it flacid fully streeeched- which after number of house becomes cold which means numbness and poor circulation but there are 2 more benifts you have to find out for your self