Hope some wonderful person has previously tried this run and can help.

I need to do a Visa run from PEK to somewhere and accumulate a few Tier Points along the way.

Currently I am thinking of flying PEK-HKG-SIN
Day 1,
Leg 1 CX6893 PEK to HKG arrival 23:55
Leg 2 CX659 HKG to SIN arrival 5:15am +1
Day 2
Leg 3 CX650 SIN to HKG departs 7:10am arrival 10:55am
Leg 4 CX6880 HKG to PEK departure 12pm

The part that I am concerned about is leg 2 to 3 at SIN, is 1:55 enough time to exit and entry then check back in? (no bags).