Best guess, how many 4* raids does your hunting area get per day?

I usually see 2 a day just in the 5 gyms I can check from home. Maybe you're missing some

2-4

Today (afternoon) I've had four 4* raids at same time of a total of 5 gyms I have near home. Never happened before.

My city has around 100 gyms and we usually have around 20 4*-raids per day

4-5.

I haven't seen one since the first week. But there are only 4 gyms in my area that I can drive to within a reasonable amount of time. But lately seems that there are nothing higher than lvl 2 raids at any of them. I've seen Eggy and magikarp at the same 2 gyms 3 days in a row now. I'm still waiting to see my 1st machamp as well.