Those are not regulated by any Act and is NOT extension.

Is to inform purchasers how long the property needed to be completed upon sign SnP.

Just like subsale, the norm is 3 + 1. But it can be 6 + 2 or 5 + 1 or whatever. As long is agreeable by seller buyer.

How else to know when to collect vp ?

Hope the following helps ...

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My understanding ..

Those are without APDL approval or pending. So the extension part wasnt given out at all in the first place.

I think the developer took the risk of selling ahead pending approval. They hope to get it within a year. By then then it should be around 24/36 months.

Even some sold pending APDL having 24/36 months, but they dont stamp the SnP until the approval is obtained.

i could be wrong but here goes.

there are 2 scenarios.

scenario 1.
developer apply to relevant authorities to extend VP date. upon approval they proceed to sell the unit with the agreed extension. i.e 42, 48 months.
as they obtained the approval prior to launch, sellers are also informed from date of purchase. no contest.

scenario 2.
developer apply for extension AFTER launching. in some cases developer got the extension and try to force it upon the purchasers. it was challenged by the purchasers and the purchasers successfully won their case. an go google. 
https://www.theedgemarkets.com/article/cour...na-condo-buyers
back to scenario 1, there are cases currently being reviewed on legality of extension in the first place. some are of the opinion that a schedule g or h shall not be modified in any circumstances and thus any extension is deemed invalid irregardless. if the developer needs more time, they can do a headstart and sell later. but of course without revenue of purchaser, cost will just continue to go up with these new trend of super tall highrises that cannot be completed in 36 months.

so from conclusion, scenario 2 can be challenged and scenario 1 is still valid for the time being.
hope this is of assistance?