I was working non-stop from the morning and I finally got a break just now
I was working non-stop since the morning and I just got a break
朝から働きづめで、やっと今昼休みが取れたのと簡素に言いたい場合は
I was working non-stop from the morning and I finally got a break just now
I was working non-stop since the morning and I just got a break
どちらでも伝わるはずです。
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またの質問をお待ちしております!