Are these sentences correct:
a) "Today, I walked for two hours with an interval in-between."
b) "Today, I walked for four hours with intervals in-between."
It's not clear what you're trying to say. Do you mean that the walking was not continuous, and you rested after one hour of walking? If so, you'd say something like the following: a.
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It's not clear what you're trying to say. Do you mean that the walking was not continuous, and you rested after one hour of walking? If so, you'd say something like the following:
a. Today I walked for two hours with a break after the first hour.
b. Today I walked for four hours with a break after each hour.