Yes the B732 was operated ETOPS across the Tasman Sea by Air NZ to all the east coast Aussie destinations. Usually filling in for a B767 or later for the B733. It also had sked services CHC Hobart and in the winter months it flew ZQN SYD ZQN every weekend.
The limiting factor for the ETOPS flights was fuel for ETPD esp when the aircraft was hushkitted to meet stage three noise.
There were 6 B732 in Air NZ were 120 minutes ETOPS approved, and there was a non ETOPS recovery route to remain within the BNE and NLK 1 hour range circles. There were a few restrictions on using this route, such as NLK had to confirm the accuracy of the TAF, NLK radio had to be available within 30 min, and NZ CAA only approved this procedure for a return to NZ.
Trying to find a heavy weight, RVSM, RNP10, Dual GPS, Dual HF, hush kitted ETOPS qualifiyed B737-200 would be one way of spending a free year or two
In answer to your Question .70/280 IAS for a range circle of 350nm (this speed can be anything an operator can put forward and be approved by their CAA and NTOed by Boeing