It usually takes me two hours to do my homework.
I am sure (or I think) tomorrow it will take me an hour to do my homework.
Yesterday it took me three hours to do my homework.
It usually takes me thirty minutes to learn new words.
Yesterday it took me ten minutes to learn new words.
I am sure tomorrow it will take me an hour to learn new words.
It usually takes me an hour to clean my room.
I am sure tomorrow it will take me three hours to clean my room.
Last Saturday it took me two hours to clean my room.
It usually takes me two hours to do the shopping.
Yesterday it took me an hour to do the shopping.
I am sure tomorrow it will take me forty minutes to do the shopping.
It usually takes me fifteen minutes to get to the stadium.
Yesterday it took me thirty minutes to get to the stadium.
I am sure tomorrow it will take me twenty minutes to get to the stadium.