1500 hrs TT. you can however test prior and have a notation stating you have not met the flight time requirements.
The 1500 hrs must include.
(1) 500 hours of cross-country flight time.
(2) 100 hours of night flight time.
(3) 75 hours of instrument flight time, in actual or simulated instrument conditions:
(4) 250 hours of flight time in an airplane as a pilot in command, or as second in command performing the duties and functions of a pilot in command while under the supervision of a pilot in command or any combination thereof, which includes at least:
(i) 100 hours of cross-country flight time ; and
(ii) 25 hours of night flight time.
(5) Not more than 100 hours of the total aeronautical experience requirements of paragraph (a) of this section may be obtained in a flight simulator or flight training device that represents an airplane, provided this aeronautical experience was obtained in an approved course conducted by a training center certificated under part 142.