The Q1 '12 version of the MVC extensions adds support for a label step property. It allows you to render only every n-th label.
.CategoryAxis(axis => axis
.Categories(s => s.DateString)
.Labels(l => l.Step(2))
Another alternative to a true DateTime axis would be to use a scatter chart to emulate it by representing the time as milliseconds. See the attached project for an example.
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