Chinese New Year Event

You'd need 30,000 envelpoes atleast to match that, at a rate of 60/hr it'll take 20 days to get that

The minimum is actually way lower than that. Out of every 50 envelopes I turn in (Turned in about 120 so far), I get around 3 sets of 100k. Assuming you got 100k meso every envelope, you'd need about 313 envelopes. I pulled about 50 envelopes in 20 mins on a low-spawn map (Bone Fish) while killing for Saint Exorcist and around 50 in the 15 mins or so I spent at Grims. Not at all hard to get them like I thought it would be.