Every user is different, but on average it will take about 1 - 3 hours to get full marks in a topic. This means that one full uTalk language of 60 topics would take up to 180 hours. But remember, this is just an estimate: some people will take more time, some less. We also recommend that, even once you've scored full marks in a topic, it's worth re-testing yourself on it after a few weeks to help move the information from your short term to your long term memory.