Remaining Elder Maps Counter?

Is it possible to get a counter on how many maps we have left before the Elder will disappear?

Correct me if I'm wrong but once the Elder and his guardians appear the influence only stays for (20)maps.
Now and I can't speak for anyone else but it can be frustrating to keep track of how many maps I've run especially over a couple days plus late nights.

I was using a notepad to keep track so I could maximize running as many maps as I could to take advantage of the influence but there's still times where I forget to write down a few - my point is that IMO we shouldn't have to use a notepad to keep track/a count.
Could we have a counter implemented in one of the corners or on some area of the Atlas that shows how many maps we have left before the Elder goes away and we lose the influence?

Surely I'm not the only person with this same thought/idea?