pw = power you want, ph = power you have, pps = power per second, t = time

this formula is not 100% correct, but very accurate (I suggest reducing the amount of zeros greatly. so instead of 100 dc it would be 100000, etc.)

(pw - ph) / (pps * 60) = t | t is displayed in minutes. to change this, remove the x 60 or increase it to 3600 to make seconds (none) or hours (* 3600)

pw = power you want, ph = power you have, t = time, fm = fusion multiplier, cm = class multiplier, am = area multiplier, im = item multiplier, sm = skill multiplier, tr = transformation multiplier, wm = weekend multiplier

(pw - ph) / ((1 * fm * cm * am * im * sm * tr * wm) * 60) = t

(still a WIP. the formula is correct though)