The Zalcano shard takes about
15 hours and 38 minutes to obtain if you are exactly on droprate.

Assumes a themed world with 15 participants at 48 kills/hour. Zalcano shard/Smolcano roll independently per player, unaffected by performance. The crystal tool seed table (crystal tool seed, uncut onyx) is a points-weighted lottery per kill — "Average" assumes an equal 1-in-15 share; "Max gear" estimates your average share (~12.9%, not a flat 25%) from being top scorer on ~25% of kills