Sep 2019: JEP Shugyo HND-OKA-HND-OKA-HND-OKA-HND-OKA-HND-OKA-HND-OKA-HND-OKA-HND-OKA-HND-OKA-HND-OKA-HND-OKA-HND over three weeks to get JAL Global Club admission at Sapphire level. Then added HND-ISG-HND-ISG-HND-ISG-HND-ISG-HND in Nov 2019 to get Premier OWE.
Dec 2023: MH Enrich 3X Elite Points SZB-KBR-SZB-TGG-SZB-AOR-SZB-AOR-SZB-(day 2)AOR-SZB-AOR-SZB on FY Firefly ATR-72s over one weekend (Saturday and Sunday) for Plat OWE. I don't know which one is crazier - this one was intense but the 2019 run was more grueling (but I am still enjoying the benefits).
Missus Nov 2023: JGC 2X after confirming continuation of OWS benefits: HKG-(JL)HND-(JL)ITM-(JL)HND-(JL)LHR-(BA metal JL code)MAD-(IB)AGP(stop)-(IB)MAD-(IB)FRA-(JL)NRT-(JL)HKG. This got her into JGC in much less time than I did. We had a Malaga holiday on redemption anyway so I took the bags while she went on run.