If wait for LTA letter , 2 weeks.
If thru taxi co, 1 week. or if they got cab for you can be 72 hours.
my took almost a month, until I call up LTA to make noise, then LTA says STA havent send them the results. !@#$%^&*#@
mine get it within 1 week then drive nissan cedric for SMRT
Yes, if you say you want to drive cedric, they tend to faster the process so as to give you within a few days.