How does new wait syntax work exactly?

[Gwaeron]

I could not {Decipher} the patch notes about the use of the new wait syntax. Can someone post an example of how to use it?

Because they only said you can now use "the syntax" and never actually explained what "the syntax" is.

/ac "Swiftcast" <me> <wait.2>
/ac "Raise" <t>