Break time is unspecified, and might be subject for further optimization. So far i do not time my breaks, but I might try it at some point. I usually take a break after the 30min or continue with the next block. Sometimes I also continue without timing for a while. (To make up for interruptions during the segment, or to finish up some item that only needs a few minutes.) The alarm means 'you are free to stop now'.

I have the habit of avoiding the hard tasks, and going for the easier ones. So most sets are about one task or project exclusively. The research I am aware of indicates that multitasking is a bad idea. So I try to avoid that. For low brain activities like cleaning up, or doing paperwork i might mix them up. The whole thing is not meant as a prison guard, but as a set of rules to overcome my own failure modes.