local function doUntil(f, check)
  while not check(f()) do
    sleep(6)
  end
end

local function someLongfunction()
-- stuff
-- stuff-- stuff
-- stuff
-- stuff-- stuff
-- stuff-- stuff-- stuff
-- stuff
-- stuff
-- stuff-- stuff
end

doUntil(someLongFunction, function(i) return i end)

taskTwo()
-- And so on.