With the duration command, you can change the duration of a mute, ban or temprole.
Cooldown: 60 seconds
Arguments
The case number of the mute or ban to modify.
The new duration (e.g. 420m). Use 0 to make permanent.
Example
/duration case_id:69 duration:420m
Aliases: retime
e.g. @Dyno duration 69 420m
To change the duration of a mute/ban to be permanent, enter
0as the duration, e.g./duration case_id:666 duration:0