This might be close to the max. for a three continents OWE; I just did SIN-LHR-IST-LHR-DXB-LHR-LAX-MIA-BGI-MIA-DFW-ACA-DFW-NRT-HKG-KUL-HKG-SIN for around US$2650. Total elapsed time 18 days, with 4 nights London, 1 IST, 2 DXB, 1 MIA, 2 BGI, 2 DFW, 2 ACA, 1 HKG and 1 KUL; 3 days of excellent sunny beaches: DXB, BGI and ACA Total miles, without bonuses, 42,078.