In one week's time or one weeks time.

[flubba]

I think the former is correct but I'm not sure, can another pedant please advise?
Thanking you kindly.

I would say "one week's time" as the time is belonging to the week

Yes - one week's time, two weeks' time.

Thank you - that's what I thought but got wobbly as I'm the only pedant one of my friends who's obsessive about grammar :o

So what about "in three weeks" - do you assume the word time and therefore write "in three weeks' " ?

"I will go in three weeks" and "I will go in three weeks' time" are correct.

Thank you powered.

Thank you, powered.

(And then I nearly wrote [bush] which might have shown a rather different emoticon than I'd anticipated! )