Seriously, even if they trained for ten years for two days a week, you've never seen someone reach a real 3rd kyu level when looking at their skill?
I would have to agree with Mr. Ledyard on this issue. I've seen people's aikido get sloppier when their attendance drops. I felt sloppy as hell the last time I missed 2 weeks due to a knee injury. Any kind of physical activity is a "use it or loose it" mentality so if you go 2 times a week you are actively loosing it for all but 2 to 3 hours that week. Is this really that hard of a concept to accept? I mean that is the reason that professional athletes and musicians exist (they spend all their time practicing so they can't afford to have another job).