How to reduce alarm duration

Hello,

I'm new to iPhone, after always being with Android.

On my previous phone, galaxy s21, the alarm went off for 5 minutes and then turned off.

On the iPhone, the alarm duration is 15 minutes from my google research, which is really long.

I need an option to reduce the alarm duration, because there are days I can't use the phone but do need the alarm (religious reasons).

Is it possible?

Thank ou