Cutoff for the 2k 5 star shards in 5 star featured arena?

Tehsigzorz

I usually just hit 7.5 mil for the 1k 5 star shards but this is the highest I have gotten(14 mil) and wanna know what is the safe spot for getting the 2k shards everytime.

AzKicker316

14M is usually safe, 15M is almost guaranteed