What is more effective, practicing little every day or doing a lot for a few days (for example, study little every day or study a lot for a few days) ? Why?

According to the question practicing little every day is more effective.

Explanation:

Study little everyday is one of the best example for practicing little every day because if we read small portions everyday it will become easy for our brain to retain the lessons what we have learnt because our mind has been structured in that way. If we try to learn everything in a single day it will lead to a big problem because we cannot retain the information what we gathered.

So according to me the first option is a better one.