Hours of limit cash?? Oh my! How on earth do you do that?

I recognise what you are saying about the switch between tournies and cash though, i've suffered as well from that although getting better.
Although this goes against some of Reds advice i tend to multitable 1 or 2 NL cash games and then kick off a big MTT at the same time, I play fairly tight on the MTT for 2-3 hours (this sits ok with the cash approach) then shut down the one or all of the cash game as the bubble approaches and move into agro mode.... once the MTT is finished I usally off to bed or maybe carry on in the same mode on a couple of 6 packs.