I am 18 this year, and I have Singapore PR, citizenship of a foreign country, and PR of a second foreign country (which I might migrate to permanently in 2016, after finishing my A levels).
From what I've read, I understand that a trip down to the ICA to renounce my PR would be sufficient for me to clear NS obligations - but since I did not perform well for my NAPFA, my enlistment date might end up being in the earlier days of December (for the PTP BMT batch), right after I've finished my A levels. While there's around 1 week from the end of my examinations to the earliest enlistment date of the December intake, I'm uncertain if that would be enough time for the entire renunciation procedure to take place. A part of me fears immigration might try to keep me in a sort of purgatory, and I'd end up having to do NS anyway.
I'm also unsure of how long the immigration department would allow me to stay in Singapore past my date of renunciation - and if I'd able to come back in the future for holidays (the country of my citizenship does not allow me visa-free access)

PS: As much as I want to stay in Singapore for NS and beyond (as I truly love this country, and I've formed strong friendships that I would have a hard time leaving behind)

TLDR: I'm a PR of Singapore possibly enlisting in December. If I renounce my PR the week before, would there be enough time for the procedure to fully run through? How long can I stay in Singapore past my renunciation? Thank you!!!!

OP deleted original message. Restored by Mod 0700. OP locked out of account. - moderator