File:Quick Super Jump Chart.png

Formula
$$B = \% change due to Quick Super Jump = (0.99 * A - (0.09 * A)^2 ) / 60$$

Preparation Phase: The player is vulnerable and grounded in this phase. It normally takes 80 frames, 60 of which are affected by Quick Super Jump.

$$C = Time in preparation phase (frames) = 20 + 60 * (1 - B)$$

Main Phase: Most of the total jump time is spent in this phase. It normally takes 130 frames.

$$D = Time in main phase (frames) = 130 * (1 - B)$$

Action Phase: Prior to 2.8.0, the player could use their main or sub weapon before landing on the ground in this phase. This phase is always 30 frames. As of update 2.8.0, the player can no longer attack during this phase, however the fact remains that the phase's duration is unchanging.

$$E = Time in action phase (frames) = 30$$

$$Total (seconds) = (C + D + E) / 60$$

Stealth Jump adds 50 frames that are not affected by Quick Super Jump. 45 frames go to the preparation phase, and 5 go to the main phase. Simply add 50 frames to the normal total.

$$Total with Stealth Jump (seconds) = (C + D + E + 50) / 60$$