How much vacation time is typical during a PhD in Singapore? Just to check if anyone is familiar with the vacation period of PhD students in Singapore?

I am considering a PhD in Singapore, there are two main universities NUS (National University of Singapore), and NTU (Nanyang Technological University).

There are two vacation periods for undergraduates, namely the "summer" break from May to July, and the "winter" break from December to Jan. (Singapore only has one season, hence the quotation marks)

However, I am not sure if the above applies for graduate students, especially PhD students on stipend.
I got my Ph.D. at NTU.  Ph.D. students would generally be getting 21 days of leave for each calendar year (i.e. Jan-Dec) in both NUS and NTU (see links below).

With a 5 day work-week, that means a maximum of 4 weeks + 1 day of leave.  This can be increased if the period coincides with one or more of Singapore's 11 public holidays (as published by the Ministry of Manpower).  No-pay leave may also be possible, if the Ph.D. supervisor agrees.

Note that Ph.D. students would be still be working during the undergraduate summer break vacation periods.

References:


http://nus.edu.sg/ngs/leave_ngss.html
http://www3.ntu.edu.sg/asis/gso/rsls_leave_policy.pdf
http://www.cee.ntu.edu.sg/Students/Graduate/PhD_MEng/Documents/Leave%20Scheme.pdf