How long is an 11U game, and how many runs can score in an inning?

Under Baseball Canada's 11U guidelines, games are six innings if time and weather permit. Three and a half innings make a regulation game if the home team has more runs than the visitors.

An offensive inning ends when three outs are recorded or when the offensive team scores five runs. If a home run goes outside the playing field limits (over the fence), the team is awarded all runs even if the total goes over the inning limit. There is no run limit in the last inning.

Source: Baseball Canada 11U Reference Rules (items 5 and 6).