The amount of time you spend on ProfitDuel is completely up to you. Every ProfitDuel member is on their own matched betting journey.
However, the more time you can set aside per day or week, the quicker you'll see your profits building up. You could even try creating a schedule so you know how much time you're able to spend matched betting.
One of the best things about matched betting is how easy it is to fit into your existing routine. Pick it up daily or a few times a week - whenever you have a spare minute. And remember: As you get more confident with the matched betting process, you'll be able to complete offers faster.