This will depend on the route you want to go down. I have a lot of members that only trade the daily charts. This means they have full-time jobs and only spend 30 mins – 1 hour a day on the daily charts.
If you have more time, you may choose the daily charts plus adding the intraday charts such as the 8 hour, 4 hour, 1 hour, and potentially even smaller, during the UK and US trading sessions. This could then take anywhere from 1-3 hours per day, depending on how narrow a time frame you wish to go.