Don’t use the built in delay for delays of more than a few seconds. Another flaw BUG when you use it for delays of (an) hour(s): it does not survive a Homey reboot: you then can end up with unfinished flows without warnings whatsoever;
And, as you’ve discovered: the delay isn’t interactive.
My preferred timer app is Chronograph;
It can start & continue a timer, start and replace a timer (reset & start again), pause and stop a timer. And it survives a Homey reboot.
This trigger card by Device
Capabilities is way more flexible compared to the built-in ones:
