I'm currently working on Mining Productivity 80+. When I use RQ to start the research, the time it tells me is infinity yet all my labs are researching. I noticed in the RQ window that the number for this research says 16, not 80 something.

Secondly, I also cannot queue up a single infinite research multiple times. For example, if I select Mining Productivity once, it queues; click it again, no new item queued.

This is because the various levels of the research are treated as one in some ways in the code, so RQ can only see one at a time. There may be a way to make it work better, but I don't know it.

I'd recommend using Auto Research once you get to that point (that's what I do).