“Try to get in around nine.”
There's a new employee working under you. She asks what time work starts. You're not very strict, so you tell her the time this way.
Try to get in around nine.
This is a soft way to tell someone, like an employee or a coworker, what to do:
Try to have it done by the end of the week.
Try to negotiate the price down a little bit before you finalize the deal.
Speaking in this way makes you seem friendly.
Talk about arriving at work with the phrase "get in":
What time do you usually get in?
I got in a little late this morning.
You can also add "to work":
What time do you usually get in to work?
When you talk about the time, you don't always need to add "o'clock". You can also just say the number:
A: When's the meeting?
B: It's at three.
Adding "o'clock" when it's not necessary makes the sentence sound more formal:
The meeting is at four o'clock.
Adding "am" or "pm" to the time when they're not necessary makes it even more formal:
The meeting will begin at nine o'clock a.m. Please arrive ten to fifteen minutes early.