[Feature request] Allow temporarily allowing for a duration, rather than a fixed end time

[thislooksfun]

I am often finding myself wanting to allow a particular app for a short period of time while I am actively using it across multiple invocations (e.g. allowing curl to connect to anywhere while I am running a script that calls it multiple times). Currently the only way to do this is to either do a blanket allow and revoke it later, or allow it until a particular time. The issue I have though is that the way of inputting how long to allow for is a bit clunky. I would love a way to say "allow this app for the next X seconds/minutes/hours". That behavior is currently possible, but only if I:

1. Figure out the current time
2. Convert that to 24hr time (not the default here)
3. Add on however much time I want, remembering to wrap for midnight if I'm working late
4. Enter that time

This process works, but it's much slower than just selecting "allow for 30 minutes" and having the computer do the math for me.