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How do I say "per" in Japanese

The sentence I'm trying to write is along the lines of, "It's just  two days, but it's 1.5 hours per day[of those two]"

I have
ただ二日だけど、１時３０分ぐらい＿＿＿＿
I'm not sure how I would attempt this or where 'per' would go, also if my sentence sucks and is incorrect, it wouldn't surprise me.
thanks.