Revisit your roster and check how many hours are between the flights you mention. Is it more than 48 hours? If so, I make that 2 days off.
The important issue is the "local night" and the trigger is normally two. I can't remember the exact times without digging the books out. Roughly speaking, if you have no duty between about 2300 and 0600
local, two nights in a row, you are legal. Basically, if you get back from a longhaul trip at 7am on Monday morning, you can legally depart on another longhaul trip on Wednesday morning without any other consideration (apart from total days off).