When you don't know the working hours, you can ask the manager directly, but the tone of the inquiry should not be too strong, which will cause the manager's disgust or dissatisfaction. Try to use polite language in conversation. If you have a very good relationship with the manager, you don't need this.

When you ask your superiors or others about things or ask for help, you must have a good tone, otherwise you will get bad results and others will not respond to you. You should ask who the other person is and answer specific words on appropriate occasions.