That looks about right. You could also use a bottle of nilodour, that stuff is available at supermarkets and works really well.
two drops for the whole room every few hours..or burnt coffee beans also masks the smell.
You could make a bucket with holes and fan in the lid sucking out nilodour into the air for a longer masking effect.
On inspections on my flat, every three months i use nilodour about three drops in my bedroom where my plants are hidden and scrubber turned off and lights turned off, tent inside a covered up wardrobe and the real estate lady never notices a thing. But the rest of my flat is spotless and shes always super stoked how clean our place is.