Sometime in 2000 I went from ABZ around Aus/NZ for a sales trip, came back, then was called back to NZ within a day or two of getting home, had to go offshore and do the job myself then came back.

No idea but it was something like ABZ-LHR-SIN-PER-MEL-SYD-AKL-NPL-AKL-SYD-SIN-LHR-ABZ and then ABZ-LHR-SIN-AKL-NPL-AKL-LAX-LHR-ABZ all within about a month.

All in economy. And much of it on BA discount fares, so I got 0 points from them.

As FatnLoud says, inadvisable.