O'Clock
suffix
If there's a number before 時, it means o'clock. For example １時 is 1:00, and ２３時 is 23:00 or 11pm.
The reading is the same as the one you learned with the kanji.
二時
two o'clock
一時
one o'clock, temporarily
三時
three o'clock
三日の午後三時に、ここで会いましょう。
See you here at 3:00 p.m. on the 3rd.
社長とのミーティングは何時ですか？
What time is the meeting with the president?
毎日午後三時にトイレの中でワニカニのレビューをします。
I do WaniKani reviews in the bathroom at 3:00 p.m. every day.