--[=[
	@within Shake
	@prop SustainTime number
	How long it takes for the shake sustains itself after fading in and
	before fading out.
	
	To sustain a shake indefinitely, set `Sustain`
	to `true`, and call the `StopSustain()` method to stop the sustain
	and fade out the shake effect.

	Defaults to `0`.
]=]