How often do you check your oil? I know it will be different if you have a car that uses oil versus one that doesn't.
Since I do mostly 3K OCI's, I don't check the oil in those cars. The one I do 5K, I check it every couple of months.
On my oil-burning '02 Camry (295K miles) every 500 miles (it uses 1qt. every 1000-1200 miles), and the same on my '95 Dakota (238K miles), depending on whether it's been hauling at highway speeds. My other two non-oil-burners get checked once or twice between 5K changes.
Once or twice during an OCI (6+ months). Really just depends on my vehicle, though. My ZJ had a leak at the adapter, so I checked the oil level once a month. My current cars now, no leaks/no burning, so I only check once or twice between intervals.
My truck uses oil, sometimes quite a bit of it, so I usually check that every time I drive. I stopped putting TCW3 in the gas (ran out, forget to buy more) so it's back up to about 1 quart every 200 when towing (yes, there is a cloud of blue smoke trailing me). My Jeep I check every time I use it, usually once a month.
The Subaru has a low oil level light so I don't check it as often. With the exception it used 1/2 quart over 6K miles on M1 AFE 0w30, it's never used any oil. So I don't worry too bad.
Usually only before 6000 mile oil change. 2013 Fiesta 50,000 + miles. Never seems to go down on the stick. I do check before a long trip. Might even change oil before 6000 mile schedule if the trip will put me much past 6000 miles OCI.
Usually once a month check of the oil during a random fuel fill-up. It is easiest at the gas station because they have paper towels right there and the ground is level.
I either do it on the weekend, like first thing Saturday morning, or at lunch time, while at work (just take a lazy stroll out to the parking lot). The oil has all drained down and all I have to do is pull the dipstick.