240g = 4 times as much as a 60 g pot.
The 60 g pots are 1%, and the 240g tubs are 2.5% flubenzadole.
So a 240 g pot equates to the number of hens you could treat with 10 small pots.
A small pot treats 20 hens, so 10 small pots or one 240 g pot would do 200, if my maths is correct.
If I treat my 6 girls three times a year, I think the large size would last around 11 years.
I think even my ancient purebreds would have died of old age by then.
Or, of course, I might have done, as well.