This is pretty much what we've done for elementary. In theory we school 5 days a week, but they attend an enrichment program 1 day a week (all elective classes) and then I'd say most weeks we end up taking one other day off for a field trip, playdate with friends, visits to family, or travel. We do go year-round, with a bit of a longer break in the summer. My kids have done fine academically, above grade level in math and reading. We don't strictly follow the Well Trained Mind method though. We've taken a very relaxed approach to history and science in elementary.