Are they a rookie team?
Do they practice year-round or just the ~10 weeks between the start of the school year and the VA/DC regional qualifiers?
How much equipment does the team have?
My teams are rookies, made up from 4th- and 5th graders (i.e. 10 year olds). One robot set (base + expansion) per team.
They meet once a week starting two weeks ago and will keep going until the November qualifiers.
This year I had the teams start with the basic robot from the printed instructions that come in every Lego Education EV3 base kit.
As the season progresses, they will be modifying/improving their robots, and by November I fearlessly predict that each team will have a completely unique robot which will bear little resemblance to what they started with.
For my teams and their circumstances, this seems to work fairly well so far. They will spend their remaining practice time split between building attachments and making other improvements to their robots, programming them, and working on their projects.