I basically looking for a time that I can set for say 10, 15 or 20 minutes and have it notify me every minute and a half to 2 minutes.
Maybe you want a Pomodoro timer? There should be a bunch of opensource apps for that if you search “Pomodoro” on F-Droid.
I think Break.Down.Timer is the only Pomodoro timer on F-Droid (or atleast the official repo)
I see these when I search for “Pomodoro” (some are no longer being maintained):
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https://f-droid.org/en/packages/com.kpz.pomodorotasks.activity/
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https://f-droid.org/en/packages/com.hlidskialf.android.pomodoro/
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https://f-droid.org/en/packages/com.apps.adrcotfas.goodtime/
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https://f-droid.org/en/packages/com.github.ympavlov.minidoro/
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https://f-droid.org/en/packages/com.superproductivity.superproductivity/