Polyclinic/public hospital

Hi mummies, a few questions I have which hope you ladies can help: -How many weeks pregnant before you visited the polyclinic for referral? -how much time should I prepare to spend at the polyclinic? -From polyclinic to visit public hospital (NUH), how long was the wait? Days, weeks? -every visit to NUH (subsided), how long is the wait? Thank you!