What time do classes start and end at Hogwarts?

Classes start at 9:00 AM and end around 5:00 PM. Hope this helped.

Copied Straight from HarryPotterWiki
The 日 begins at 7:30 a.m. with breakfast in the Great Hall. During breakfast, the mail arrives in a flurry of hundreds of owls. A ベル chime signals the start of the first class at 9 a.m. The ベル chimes again in one 時 to signal the start of the 次 class.

There are four class periods before lunch (though NEWT student may have breaks during some of these), scheduled according to house. After lunch, there is another break and two もっと見る classes[6].

晩餐, 夕食 is served in the Great Hall towards evening, after which the students are expected to be in their House common rooms for studying and socialising.

There is an Astronomy class at night on Wednesday every week (usually midnight).

The students must be in ベッド または in the common rooms によって a certain time, after which is called after hours. The times are different for different years (for example, fifth years are allowed to be in the halls until 9:00)

Sorry, I’m getting back to あなた really late! I think classes would start around 9am because the morning ベル most likely rings at 7:30 to give students time for breakfast. Then breakfast is at 8:00am and goes on for an hour. Then in the evening classes would probably end at 6:30, which gives them the 30minute break that’s required. Then lunch is at 7:00pm and all the other クラブ and activities take place after 8:00pm until 9:30pm when their curfew most likely is. But the exception is for astronomy lessons because hogwarts is known to House midnight astronomy lessons. So it really just depends on your schedule.