If there are 40 lessons online
and they are 15 minutes each
instead of speeding through the lessons 2,3,4 in a day
listen to one
early in the morning
very early
after waking
write
after writing, during a break, listen to a lesson
while you stretch
Consider training yourself like a dog.
TL;DR Listen to the same, short lesson, multiple times throughout the day. This process is preferable to one long session listening to multiple lessons. This process is also preferable to listening to listening to one lesson once a day.
if you want to listen to another lesson
if you want to learn more
then listen to the same lesson again
you might listen to the same lesson 2,3,4 times a day
this is the way
this is preferable to listening to multiple lessons once
consider training like a dog