25 hours longest here, technically. Took 6 hours to get him to even 50% due to only having 5-7 COR at low % then maintenance was announced for one hour later so no chance to finish. Went to bed and logged at the battlefield, logged back on and it was still going with him at 99% rejoined and fought for another 8 hours or so slowly getting more COR. All that so I wouldn't lose 50k bayld that I could have farmed back in a few hours.