VRF - How many interfaces can be under one VRF rule?

Hello
How many interfaces can be under one VRF rule?

my experiment …
So I create 500 vlans and then put it to one vrf rule
is this a right way to add so many vlans to the one rule or can be another method?
500-vlans.png

I believe Janis did some testing on maximums on v6. Maybe email support for an official answer.