I would counsel against using varnish on a kitchen floor, even Superharddoublediamondespeciallyforkitchenfloorsreassuringlyexpensiveatfortyquidatin Varnish.
Kitchen floors get such hard wear (grit coming in on shoes, chair and table legs sliding about, grit getting under chair and table legs, that even seven coats of Superharddoublediamondespeciallyforkitchenfloorsreassuringlyexpensiveatfortyquidatin Varnish, in my experience, lasted about two weeks.
I'm a complete convert to wax, preferably OS hard wax, or polyx or whatever it is now.
very easy to apply, very hard wearing, even on floors, and non sticky, so it doesn't accumulate grit like soft waxes may, and easy to repair and make good in small areas.
One day, I will pluck up the energy to resand my beautiful original oak parquet floor, and get the horrible patchy dirty Superharddoublediamondespeciallyforkitchenfloorsreassuringlyexpensiveatfortyquidatin Varnish that lasted 2 weeks off and apply some lovely wax. I wonder how many sander belts I'll get through?