I normally only use around 50ml through a fine spray gun.
We have 3 bikes, they all get a good dose of ACF-50 in spring and again in the Autumn, with the odd little quick spray after a good wash in the areas that get the worst of grime, do the odd bike for mates....
... and a 1L bottle has lasted me a couple of years, I reckon you can do a thorough job and get at least 20 applications from a 1L bottle, using a whole bottle in one go is like me drinking 50 pints, total waste of money as the job is done after the first 5.
Got my eye on an ALDI compressor and air gun to spay it more efficiently.
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I thought that yesterday too.