Only a game start time, and an optional dismissal time, can be entered.

In all the places a game shows up, there is usually no duration, and for viewing in an RSS feed in ios calendar app, or google calendar etc., it is a thin sliver in length, looking less significant than practices.

Strangely, it has an end time of an hour later when viewing your child's schedule as a parent.

Yes, you never really know how long a game will be, but making an estimate would be reasonable.