I remember I had tremendous difficulty with the Olympics back in 2004 (!), when they were airing it in 8-hour blocks on the HD channel. (This would've been with an HR10-250, OTA.) Just recording one of those blocks made the TiVo act flaky. I haven't attempted (and haven't had occasion to attempt) such a long recording since then, although I seem to recall lesser issues with some rare 4-hour recordings.
Anyway, I'd give up on this idea. If you really want to watch it for 14 hours straight, you can always use Folder Play.
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