Like exercise, learning a language is not something you can do once a week. If you want to make any progress, you really need to put in at least 3 days a week. Obviously the more days you practice, the faster the progress.
The good news is that if you practice daily, for 10-15 minutes, that is enough to make progress at a very reasonable rate.
My recommendation is to stick to 2-3 things and do those for a while. For example:
On Mondays, Fridays & Saturdays, DuoLingo for 15 minutes
On Tuesdays & Thursdays, reading for 15 minutes
On Wednesdays, watching a 30-60 minute tv show
Sundays – off
This is just an example, you can choose any 2-3 things that work for you, appropriate for your level (DuoLingo will NOT help you get to an advanced level).
What is your routine?