How long does it usually take you to do your homework? Which subject takes the longest? Do you think it’s necessary to plan one’s day or not, and why? Ответьте на вопросы, пожалуйста.

It usually takes me up to three hours to do my homework (или to get done with my homework). Math takes the longest time. I think it's necessary to plan your day because this way it will be easier to get done with everything you need on time.