payment of CGT on disposal of residential property due date

Hi, the notes say that it has to be within 30 days of disposal of residential property but I was going through an ACCA technical article and it said 60 days, can you please clarify which one is correct so that I can make amend my notes if required. The link to the article is https://www.accaglobal.com/uk/en/technical-activities/uk-tech/in-practice/2023/january/cgt-disposal-residential-properties.html