[Feature Request] Allow use of Custom Variable for the Duration of a Custom Variable

[DragynsLair]

Allow use of Custom Variable for the Duration of a Custom Variable

[CKY-]

Can we extend this to allow variables in all durations and include custom variables.
there are many use cases where using a static number is ok, but that are a few examples of using variables of all types as a duration can be useful

Edit:
for example play sound effect for x ,
play video for x
show image for x
show text for x
delay x
and TTL x Seconds

where x is is a constant variable but then math can be applied to allow for x-2 or x/2 and so on..