On my way back to civilization and tripped over one with 101 which is by far the most I've seen personally, but I suspect nowhere near tops. Got me to thinking about what others have seen and how big other systems may be.
106 objects. Now get this, most of them were helium giants... those are uncommon, but when you do find them, they come in groups....many white planets.
Personally the most I have seen is 62 and that system only had 1 belt, but I have only explored approx. 1500LY of the black thus far as I am new to exploring.