The request is a bit dated, but if it can help... In general, 1 hour after the broadcast (source: CNC - TV-replay - May 2013), and they are usually available for 7 days.
In general, catch up TV programs (replay TV) remain online for 7 days, sometimes 15. To check if a TV program is available online, you can go to https://www.programme-television.org/replay. All programs are listed there in real time.