It will depend on the volume of honey you want to warm as a large bucket times a while for the heat to get through. For my cabinet, i leave a 15kg bucket in for 24 hours or so at 50C. Although my cabinet does not have heat evenly distributed (Job for winter to fit a fan). The above temp may not be enough for all the honey to be heated through enough to make it all runny, so jars may go back in. Once warmed through the lids can be tightened warm and then they get concave once the honey cools.
May your bees read the same books as you do.