With DisneyLife, you can download as much or as little as you like. The only limit is the amount of free space on your device.
You can adjust the video quality of downloads which will change the amount of time and space your download needs. Go here: Can I adjust the video picture quality? to find out more!
If you want to, you can set a limit on how much space DisneyLife uses. For more on this, check out How do I change my Download Restrictions?