I would suggest it is not a yes-no answer to the question of how long until you lose it. Instead it is a continuum with the loss of ability to deal with abnormals and emergencies and more demanding conditions occurring first.
Obviously the OP handled his abnormal well but that was helped by flying on a day with benign conditions. Personally I find that it takes about 10 minutes to get comfortable again after a significant break from flying. The challenge, of course, is will I be able to effectively deal with a major emergency in that 10 minutes ? I like to think that there is enough residual competence that the answer is yes but make a point of not doing anything sporty until I am comfortable again.
I would also note that flying a very different type after a long break can be just as challenging as not flying at all.