Board Thread:Questions and Answers/@comment-32906994-20180124023406/@comment-31661832-20180124062319

Indeed it is. On average it costs like 51 million zeni and 5800 stamina (that's assuming you end up needing 18 copies because of the 50% rate).

To put that in context, you won't even regenerate that much stamina before the event leaves on 8th of February (1 stamina every 5 minutes adds up to around 4,600 by the 8th). So yeah, you'll likely need to spend DS unless you get lucky and don't need 18 copies.

Keep in mind that 4,600 is you not spending stamina on anything else (including WT this weekend) and never letting your stamina max before playing :/

Hooray for depressing maths