I would guess 8-10 hours if they haven't done one before. It took me about 8, but I have no interior to worry about, so that saved some time.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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