WordGo is designed to fit around your schedule. When setting up the app you will choose how long you would like to study for each day. Depending on the length of time you choose you will see a number of questions to help you stick to that time. If you'd like to see more or less questions it's really simple to change your settings;
Tap the profile icon on the bottom right of the screen.
Tap the Study Preferences heading,
Tap Change Study Settings,
Adjust 'How long' according to your desired time,
Select 'Next' to complete the time adjustment and tap confirm when ready.