Which one is correct and what is the difference? Are they interchangeable? Should I use "for" with a while?

I understand that some time means for a long period of time but I mean about a description a period of time of an unknown length.

I liked it for some time. For some time he wanted to be a doctor.

I liked it for a while. For a while he wanted to be a doctor.

  • There is no meaningful distinction between the two. Both leave the period concerned undefined, whether hours, days, months or years. – Ronald Sole Dec 28 '19 at 19:12

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