How much transaxle fuid in the manual transmission of a 2001 Maxima?

Something got lost in your post, and it's a bit hard to tell what you want. I assume you are looking for a used transaxle for a Nissan Maxima, and there is a possibility that transaxles from certain other models are identical or at least compatible. Find the manufacturer's brand name, model or part number for your transaxle, then do a web search for it. See what vehicle models come up in the search; that will be your answer. You may need to narrow it down, perhaps by adding the word "specifications" to the search terms.

Sounds like a failed transaxle

You drive 20 miles or use a vehicle for days like
that,you ruined it,period,no relearn will fix internal
damage

Not many transaxle's see 100,000 miles or ten years

It sounds like the problem is within the transaxle and although it is fixable, requires the complete removal and disassembly of the transmission to get to the speedo drive.

LOOK IN OWNERS MANUAL IN GLOVE COMPARTMENT. OR HAYNES REPAIR MANUAL, YOUR TRANSMISSION HAS A FILL PLUG BELOW TRANSAXLE AND A CHECK PLUG ON TRANSMISSION. YOU NEED MANUALS TO SEE THE LOCATION WHERE TO PUT TRANSMISSION FLUID.

VEHICLE SPEED SENSOR SHOULD BE LOCATED ON THE TRANSMISSION! SOME HAVE A SPEEDOMETER CABLE ATTACHED TO THEM, AND SOME DON'T! ON FRONT WHEEL DRIVE, THEY ARE LOCATED ON THE PASSENGER SIDE NEXT TO THE FIREWALL ON TOP OF THE TRANSAXLE! YOU MAY HAVE TO REMOVE THE Y-PIPE TO THE EXHAUST, AND A HEAT SHIELD, TO GET TO IT!

Manual Transmission,2WD......GL-5
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
Manual Transmission,2WD......GL-4
Synthetic Manual Transmission and Transaxle Gear Lube (75W-90) API GL-4 (MTGQT)
Manual Transmission,4WD......GL-5
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
Manual Transmission,4WD......GL-4
Synthetic Manual Transmission and Transaxle Gear Lube (75W-90) API GL-4 (MTGQT)

Standard Differential, Rear......GL-5
All TEMPS......80W-90, 90
SAE 80W-90 Synthetic Gear Lube (AGLQT)
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)
SEVERE GEAR 75W-110 Synthetic EP Lubricant (SVTQT)
Differential, Front......GL-5
All TEMPS......80W-90, 90
SAE 80W-90 Synthetic Gear Lube (AGLQT)
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)
SEVERE GEAR 75W-110 Synthetic EP Lubricant (SVTQT)
Transfer Case,......GL-5
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
Transfer Case,......GL-4
Synthetic Manual Transmission and Transaxle Gear Lube (75W-90) API GL-4 (MTGQT)

It may be leaking from the transmission pan gasket or either of the transaxle seals. If it's leaking from the middle front of the transmission, it could be the front pump seal, if it's that, you'll have to remove the transmission to replace that seal. They others can be done with the transmission in the car.

With the MAJOR loss of transmission fluid your vehicle will surge and "buck"
DO NOT drive your vehicle UNTIL you find out where the leak is coming from.
If you drive without the proper amount of transmission fluid YOU WILL RUIN the transmission.
Wipe all fuid off the transmission, and see if you can locate leak, WITHOUT engine running.
Please let me know.

i will assume that you are referring to the clutch master cylinder , you bleed the system at the clutch slave cylinder located on the transmission bellhousing