When you heat up water in the teakettle, you need to leave the heat on until it starts whistling.
If you turn the heat on, then turn it off, then turn it on, then turn it off, it will never come to a boil.
Duh, right?
It's the same thing with a practice of any kind. Getting time in every single day will be exponentially more effective than a couple days here and there.
Turn the heat on. Leave it on. See what happens.