I'd guess you could R&R the dash in about 4 hours, maybe less. You'll need to remove the glovebox, steering wheel, instrument panel, pushbutton unit, front speakers and both kick panels before you can pull the dash. It helps if you've pulled some of that stuff before. All in all it's not especially hard, it's just a lot to do.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold