Depends on the ester. Starts in about 2 weeks with enanthate. I'm a pretty prolific sweater to start, but I soak the sheets and pillow most nights once it starts.
ive used it four times and only had them once but when i did, it was fucking bad man... my poor wife got soaked nightly for so many weeks and it since it was tren e, it lingered a good 3-4 weeks after i stopped... whatever the reason, i have other sides my other cycles with it, but not the night sweats...