Schools can run the programme whenever suits them best: during normal school teaching hours, lunchtime, or before or after school.
If you wish to run the programme during normal school hours, one or more classrooms, or the school as a whole, may be technically closed for up to one hour a week or 20 hours a year to do so (section 56 of the Education and Training Act). That means schools can run one or more 30-minute Launchpad Champions programmes concurrently during normal school hours each week during all four school terms.