Less than a second to gain on this I think. Held 2nd Avalanche Punch a few frames to make sure I got the BLJ. It is important to approach from this angle since the upper platform is sloped where I aim.

Alternatively, you could Jump, Direct, BLJ and stomp onto the wall and then jump from there. This might be faster, but I couldn't get the stomp to land on top in about 40 attempts.