What is the length of the serpentine belt? - 1997 Buick LeSabre

That isn't the way to do it. You should have a bypass pulley, which keeps the route and the angles and the same length belt.

Details of bypass and the serpentine belt diagram in the link

https://www.google.com/search?q=2006+Nissan+Altima.+Serpentine+belt+diagram+no+air+conditioning&tbm=isch&ved=2ahUKEwiT2pXX38H0AhWQsHIEHZE8ARMQ2-cCegQIABAA&oq=2006+Nissan+Altima.+Serpentine+belt+diagram+no+air+conditioning&gs_lcp=CgNpbWcQAzoHCCMQ7wMQJ1CQGliJTmC4aWgBcAB4AIABa4gBnwiSAQQxMi4xmAEAoAEBqgELZ3dzLXdpei1pbWfAAQE&sclient=img&ei=0femYdOtEpDhytMPkfmEmAE&bih=937&biw=1920&rlz=1C1QJDB_enCA643CA644

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there is a 6 cylinder and 4 cylinder for that model. also probably a belt routing issue

Audi a4 a6 2 8 Serpentine Belt OEM ContiTech

1996 AUDI A6 Serpentine Belt Diagram for V6 2 8 Liter Engine Serpentine...

http://serpentinebelt-replacement.com/1996AudiA6SerpentineBeltReplacement

Audi Accessory Belts

Midas does a.c. work,had my 85 nissan 720 fixed recently.Here's a link to your belts.

Here's a link to your serpentine belt and length.It says 82.5 inches.

Diagram reference number 1 in the image below:
"" Fitment: 2006 SUBARU B9 TRIBECA - 4 door

Application Notes:

Category: Electrical. Charging and Starting

SubCategory: Alternator / Generator and Related Components

Position: General

Part Number: 809221090


This is a Serpentine Belt that fits the 2006 SUBARU B9 TRIBECA - 4 door with the EZ30D engine. The Serpentine Belt is designed by SUBARU to be part of the Electrical. Charging and Starting-Alternator / Generator and Related Components. The Serpentine Belt has a position on the vehicle of General. The 2006 SUBARU B9 TRIBECA Serpentine Belt is a factory made SUBARU OEM part and it comes with a 12 month 12.000 mile warranty (parts only). Do not be fooled by an aftermarket SUBARU B9 TRIBECA Serpentine Belt! Buy a factory SUBARU part and receive peace of mind!
This factory part has a part number of 809221090. "

Take the old belt off. Place a piece of string around the pulleys in the correct routing location. The length of the string is the length of the belt you would need.

Pry the tensioner with appropiate tool, then pull the belt off the alternator pulley before releasing the tensioner. Note the routing of belt before doing this job. Make sure the new belt is same length before putting back on, reverse the procedure.

Here you go.. I looked up the same belt you did, it should be right.