1

To describe How I was busy, I could say

I worked the whole day.

to emphasize the non stop work, I guess I could add more

I worked the whole day, I didn't even go to the bathroom one time.

or

I worked the whole day, I didn't even go to the bathroom, not even one time.

My concern is the part one time, is it idiomatic to say that?

2

Yes, adding "one time" is completely idiomatic and natural sounding. Particularly your first sentence. All though I would replace "the whole day" with "all day".

Having "even" twice in that second sentence is a little awkward. I would either say:

I worked all day. I didn't even go to the bathroom one time.

Or

I was so busy all day, I didn't go to the bathroom. Not even once.

3
  • 'One time' is more American, 'once' is more rest-of-world. Mar 6 '20 at 23:38
  • Native AmE speaker. I probably use "once" at least as often as "one time", maybe more
    – Kevin
    Mar 7 '20 at 3:04
  • Native BrE speaker, I use 'x times' if x is three or more. Mar 7 '20 at 10:16

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