It is what it says on the tin - 7pm till 7am (weekdays) and all weekend. See full details in this article:
https://community.talktalk.co.uk/t5/Articles/About-our-Boosts/ta-p/2204813
You can easily find this sort of information via the forum search engine.
Gliwmaeden2, a fellow customer.
From the 29th of March our TalkTalk Community will move to peer-to-peer support and the TalkTalk team will no longer be here to support with queries. Don’t worry we still have plenty of ways to reach out if you need to speak to TalkTalk directly. For more details check out the link in the post at the top of any forum message board.
