This article helps with: How long are my entries valid for? For a single entry? Do I have to enter again?
Am I automatically entered for the next draw?, Is the payment for that day only, Would have to pay again, Are the entries per day, Do I need to enter again.
Your entries are valid from the point of purchase, up until the draw date (please see T&Cs for more specific details).
Where a rollover situation can apply, all entries remain in the draw. They will stay in until there is a winner. Entrants don't need to enter again unless they wish to add to their existing entries.