Only available at opening, 1230h and 1430h. Due to its popularity you either have to queue in the heat, come twice (once to order and once to pick up 1-2h later), or pre order. Pre ordering involves playing a "fastest fingers first" game at 4pm on Saturdays, which only works if you are organised (set alarm clock) + tech savvy.
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Is it worth the effort though? It's certainly one of the better croissants in sg, since you get it fresh out of the oven unlike many other bakeries. It's crispy on the outside rather than flaky, and the inside is chewy and a bit wet, rather than fluffy. But then again you can't get the ideal croissant anywhere in sg so.... A good option if you can't fly overseas. Lucky you if you live nearby.