Which to do?

As Emlalock is full of horrible bugs, there's currently no way around thechaste.com. But beware that the settings are counter-intuitive, and your first sessions will probably not feature the desired starting and maximum durations. If you have a keyholder, only the keyholder defines the maximum duration. Don't ever select "Anonymous" as your keyholder, as that that isn't an anonymous keyholder as you would expect. It actually means "none" and that your settings are locked and you can no more select a keyholder.

 

Try chastikey

 

If you MUST have the human interaction involved, I'd say EL, BUT, if you can go without that, give an alternate site a try for some randomness of 'when' but nothing else:
https://keyholder.r307.com/
It's boring for many, but clean and simple to surrender the combo image and get it back when the time is up...

 

Why did you ask if you ignore all the answers and finally do exactly the opposite? Do you make fun out of fooling other people?
Going for a "permanent challenge" is just another indication that you aren't serious. If that is true, you will abort the session sooner or later or abandon it silently. In the latter case, it will become one of these zombie sessions that spam the voting lists forever. That this is possible, is just another Emlalock bug that has been reported many times but never fixed.