Ex: Eu estudo pela tarde, de 13:00 a 17:30
1-
Vamos ver se consigo te ajudar:
What time do you study? What time does he study?
Is it in the morning or in the afternoon from 1.00 to 5.50 (PM)? 
Note: costumamos usar a referência de 12 horas, com variação de AM e PM. No caso em questão é óbvio que se trata de PM por ser “in the afternoon”
Cheers!
2-
And also:
What’s your class schedule like?
What’s your class schedule like?
More like a University student question, since there´s not a precise schedule to them, usually with a diverse set of subjects – in a semester, for example. Hence the “like”.
What time of the day do you study?
What time does your school begin?