Actually you would only need to do one to & landing, you would then be valid until 90 days from 3 August, if you did not get this one in by then you would need to do 2 to & ldgs. You will only need to do 3 circuits if you go more than 90 days from 10 September. (So if the above dates are actual dates you only need to do 2 landings to fly pax if you get it in by 9th December if my calculations are correct, but if you then do not do another flight, with or without pax, by that date, you will then need ANOTHER to & ldg without pax before you fly with pax).