boraticus, I think we've discussed this before when talking about new-engine break-in. My experience has been very different from yours with multiple brands of engine ... Tecumseh, Honda (not Chonda), B&S, etc ...
All that were run 6+ hours before their first change had their oil looking like mercury/quicksilver. So, I typically change oil at the 2, 6 and 12 hour marks before beginning a once-per-year schedule.
I will change the oil in my forthcoming Ariens snowblower (B&S engine) after the first storm and see what it looks like. This will be my first new piece of OPE since about 2005-2006 when dad bought his wood splitter. If it's clean, I'll go the rest of the season before the next change ... but I don't expect it will be.