Talk:"Ayakashi Anniversary Tower"/@comment-24122694-20140529020020

Assuming HP consumption remains unchanged from the previous tower:

20830 - (13*24+9)*60 = 1570

Excluding the amount of health you have at the beginning of the tower, and any level-up refills, you'll still need 1570 health to complete the tower with no overflow.

Do note that the health regeneration timer resets every time you investigate or use a candy/DN/rem, and that encountering a WG will cost you the health needed for one investigation but will not move you one step forward, so be sure to leave at least one extra DN's worth of margin in your calculations. ^^