Welcome back Gerjaffers,
It's our pleasure! Regarding the timer, you can absolutely set a timer for one hour, which will also interrupt any audio that you are currently listening to. We wanted to be sure we provided some steps for those situations to ensure you're able to enjoy your run, and also head home when needed.
The steps in the article we provided regarding alarms also contains steps that you can use if the alarm volume is too low. We wanted to be sure the alarm is loud enough while listening to music, and that you have options to help resolve it if you're on the go.
We're happy to see you here on Apple Support Communities, and are always happy to assist.
Have a lovely day!