Mrmum
I dont think that running over the 50 hour check is a big issue, depending on factors my aircraft get the oil change at anything between 45 & 55 hours but I try to make the oil change as close to 50 as I can.
In club aircraft the checks usually come around quite quickly so I would not change oil on an hourly basis, on aa engine that will only fly a few hours a month I would think about changing the oil at 3 month intervals on W80/100 or is months on W80/100 plus or W15W50.