Front main seal replacement

[SBSerpent]

The oil leak is a little confusing to me. A day after driving the car, I noticed an oil puddle on the garage floor directly under the harmonic balancer, about the size of a quarter. I wiped up the oil spot and noticed a film of oil on the oil pan flange at the location where the flange is curved to accommodate the crank. I wiped the oil pan flange to remove the film of oil and then placed a sheet of white paper on the garage floor to see if any more oil would leak. The next day, there was again a spot of oil, albeit somewhat less than the size of a quarter. A film of oil once again on the oil pan flange. Wiped the flange clean and moved the sheet of white paper over a bit to see if any more oil would leak. Lo and behold, the next day (3rd day of leaking oil) there was once again a spot of oil. A smaller amount than the previous 2 days but still there.

Here's where the confusion lies. I can understand the oil leak over the course of 24 hours after parking the car. The oil all flows down back into the pan after the motor is turned off and thus the leak. But after 24 hours, you would figure that all the oil is now in the pan. Why am I still seeing a leak appear 48 and 72 hours after I had parked the car? It's not like the front main seal has an oil reservoir behind it where it keeps leaking from (i.e. like a loose oil temp sensor that leaks oil due to the pressure of the standing oil in the oil pan).

Thoughts?