one thing get fast you can not keep an audiences attention today a long as they payed attention to houdini he had hours you have minutes
The claim that Houdini had 'hours' is a common innacuracy. TRUE, he was able, at the turn of the century, to take from 12 minutes to an hour and a half on challenges, but by the faster-paced 1920s, Houdini was doing faster escapes, notably the Water Torture Cell.
We live in a faster-paced society, but speed is a 'relative' concept.
I don't recommend going beyond two or three minutes for a release from a 'feature escape' item, except under unusual circumstances where suspense has been built and the spectators are biting their nails.
Simple escapes, like the Siberian Chain, should be 'impossibly' fast (seconds or a split-second), giving the impression that the restraint is 'child's-play' for the performer, and that he is just 'warming up.'
More serious devices, such as the straitjacket, Tom Horn Belt, etc. should take more time and far more apparent physical effort. As in TV wrestling, give the audience a 'battle to watch'; they love a good struggle and mentally struggle along with you.
'Dangerous' escapes should take long enough to make it look like you are in trouble (without taking TOO long).