how can i revise this sentence using more formal word choices.

Question

I spend tons of my time on my English class because writing and researching stuff is hard.

Answer 1

I take a considerable amount of time on my English course, because it is difficult to write and research topics.

Answer 2

Even more concisely:

I spend a great deal of time on my English coursework because research and writing are difficult.

Answer 3

Explain your changes?