It depends on the subs you’re working on but it’s recommended to start out at 1 minute and to NOT increase the length until you have ZERO Recon. So one listening day one day off. If you experience no Recon than increase ALL Subs another 30 seconds and stay at that until NO Recon.
By no means I’m I being prickly or salty but if you’re having to take more than 1 rest day you’re doing it wrong and need to reduce the amount of listening time. It’s not a race. You will have much better success with shorter loops.
I’m only half way into my round using this technique but I decided to only work on GLM. That is a very condensed Sub and there is a ton to it so the recommendation with one title is to run it twice a day on listening day and then one rest day.
But I recommend reducing your loop time back down to 5 minutes and see if that works. If that doesn’t work than bring it down to 3 minutes and take it from there.
Saint often only runs 30 second loops and he’s very advanced at running Subs so that should tell you something. 
Saint just mentioned that there will be an official post coming up very soon and the Microloop protocol will be the new official protocol. Not sure if it’s changed at all since this post
Experimental Microloop Protocol