i applied for pr after 12 months on an EP...this was in november time a coupla years back (conspiracy theorist would say the quota runs out towards end of the year)
but mine was approved in 5 weeks.
i dont know if this helped, but i purchased a
property 5 months after i arrived which was about 7months prior to my application
IMHO i do sincerely think that the government wishes to see your commitment to remain in singapore....
just my two yen's thoughts.