Per the protocol, 2-3 drops are required per slide coating. Estimating a volume of 0.1 ml to 0.15 ml for 2-3 drops would mean that 200-300 slides could be coated per 30 ml bottle of C9368 - CC/Mount™.
https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/documents/321/312/c9368pis.pdf