A back up procedure to a TDP of 200 ft isn't going to take double the time to reach 200 ft in a vertical climb - why would it?
Let's say max take off power into wind in a vertical climb gives 600 ft/min ROC. so 20 secs to TDP then.
Now using same criteria going backwards, having less (if no) head wind, using more pedal (and therefore more power) and having a longer distance to go (The hypotenuse) with same power available will obviously reduce ROC, then you have to rotate even more at the top (from nose up attitude to nose down).Then allow time to accelerate forwards to zero GS. So taking twice as long is a guess on my part, but every one I have seen appears to take twice as long as a simple up, rotate and away.