Times of the day should always use digits, not words.
Separate the hours and minutes with a colon.
Use this format for time in marketing content, blog posts, and web pages: 12:30 p.m., not 12:30pm or 12:30 PM.
For user interface (UI) content, align to the product's format.
When you need to specify the length of a video, use the 0:00 format (0:30; 2:36; 1:40:12). Note that in body copy, you should always refer to a video's length as 4.5 minutes, not 4 1/2 minutes.