How much time would it take to learn html, js, css, php, c++ and python if I everyday complete 4-5 lessons of each language?

Answer 1

It would take approx 101 days if you do 4 lessons a day and 81 days if you do 5 lessons a day
Break down:

HTML - 44 lessons
CSS - 76 lessons
JS - 59 lessons
PHP - 51 lessons
Python - 94 lessons
C++ - 80 lessons
Total = 404 lessons

And don't forget those quizzes you have to solve.

Answer 2

You can't calculate like that.

The courses here only give an overview about a language. They're by far not exhaustive.

Learning C++ properly alone may take you years.

More important than calculation games like that is that you pick a valuable project you want to do and learn everything you need for that in a targeted fashion.

It takes as long as it takes.

Answer 3

Yes you divide the total number of lessons by the average lessons you do in a day but as Honfu said that's not an effective way to learn for most people unless you want to just get an overview of each.