Before wedding itself it was cleared that KP will miss one episode of NB and the 2 ladies will come in their characters in that episode to fill in KP's vacuum.
Secondly, KP is already honeymooning in Goa, within India itself that too a place which is very close to Mumbai as he has very less time and we had got the news that he has got 15/10 days of holidays out of which 8 days are already up.
So chill !! He will be back soon. Even the makers of YHM are aware that RKB is as much important in the show as Ishita is they will not allow KP to take leave for so many days.