how often does E33 depart from hong kong airport and how long would it takes to arrive Tuen Mun?

The frequency of bus no. E33 is 10-15min. If you get off at its terminal station at Tsuen Mun, it takes 80-85min. If you just wanna drop off at the Tuen Mun MTR station, bus no. A33 should be a better choice. By that, you can get off at TUEN MUN RAILWAY STATION BUS TERMINUS and walk to your destination then.