In theory, if the flow meter is accurate, you should get slightly under 10 hrs of flow time. That said, the flow meter is not set at atmospheric pressure (usually about 70 psi or so, but really depends on your pressure drop and actual flow characteristics a the regulator).
You won't get all of the argon out either.
Only way to tell is to try it. It will be different everytime. If you were an industrial user using it the same way everyday, you could estimate. No real way to tell for a hobby user.
Shoptask 3-in-1 (not currently in my garage, but I own it...)
Any day on a motorcycle like this that ends just needing parts and labor is a good day.
4.95, 154mph 1/8th mile 7.49, 194.27mph 1/4 mile