A few months ago, Nachman was on with Imus and said they'd had a meeting the previous day, where the following factoid was put forth: In the last five years, MSNBC had made SIXTY-NINE changes to its primetime schedule. Fox had only made two: Once when Paula Zahn jumped ship (and thus was beyond their control) and the other when they simply switched two shows' time slots.
Since that interview, MSNBC has fiddled with primetime at least twice.