How much speaker wire?

How much speaker wire will I need for a 1990 Ford Mustang? This is a more complicated question than people think. I am going to be running two amplifiers, one 2-channel for kick panels under the driver's seat, and one 4-channel for front and rear components under the passenger seat. That's connecting 6 speakers, two in the doors, two in the dash, and two for the rear sides. I'd prefer answers from people who either have a fox body mustang, or people who have done something similar to the same generation mustang.

I would guess around 50 or 60 feet would be sufficient.

Also, how much wire would I need to replace the wires between the following? (big 3, I'll be using 0 gauge for these wires)

Battery - to chassis

Engine/transmission to chassis

Alternator to Battery +

Thank you for any help.