I averaged about 2 rings per shard dump, for me it takes about 10 mins to do 4 grifts (at 115+, you could of course go lower for more speed) and fill my shards. That’s 12 rings an hour not counting any potential drops if that’s your primary goal.
Lets call it 10 to be somewhat pessimistic. That’s 3 hours for 30 rings. Unless you have extremely poor RNG that should have you covered. So 4 hours in total.
Is it more than your daily playtime? Maybe, but it’s not an exorbitant amount of time.
It’s a game you play for enjoyment, if you don’t enjoy the basic gameplay, why the hell do you play?