How often do payouts occur for the Singapore Investing portfolio?

You should get the payouts as soon as it’s distributed and so we don’t aggregate the underlying funds’ payouts to smooth out the distribution over the course of a year. 

Hence, the dividend payout is dependent on the schedule of each ETFs. There may be a month when a handful of ETFs schedule their payouts; there may be months in which none of the 6 ETFs distribute dividends and no income is paid out at all.