Depends on the filter you are using and your driving habits.
I'm not a fan of long drains on personal vehicles. Need to do UOA's to see whats going on and the price of oil it makes more sense to just change the oil, 2 UOA's and I paid for the oil change. The length of drain/filter changes varies significantly with operating parameters. A lot of new cars take into count cold starts, counts engine revolutions, etc to decide what % oil life to display.
Synthetic oil is fine, but so is most regular oils. And in the US, most synthetic oils are truly "synthetic" by the oil industry's view. A lot of the off the shelf parts store synthetics are actually Group III base oils, which are really still considered conventional. Some higher end synthetics that use Group IV or V base oils are truly synthetic. There are also some "cheap" synthetics that are very good. Much as I hate to admit it, the Penzoil Platinum base oil is a GTL (gas to liquid) base oil that's made from natural gas and is a very stable and clean base oil.
If a person wants to do the crazy long drains like 10k+ miles but do a filter swap then a synthetic media filter is helpful. The most commonly available options are the Wix XE filters.
At the end of the day for a daily driver non race application I think pretty much ANY modern oil changed at a reasonable interval is just fine. 4-8k miles depending on usage is what I personally prefer. Oil is cheap.
Last year we finished up a test at work that Phillips66 asked us to help with and we ran some of our on-road equipment and never changed the oil, only topped off the additive package doing a base oil test. After it's all said and done, given our duty cycle, use profile and life-cycle cost, it doesn't save us any more pushing our changes out past 6500 miles. Which equals about 3000 gallons a month of engine oil we go through here.
Another thing to consider about oil usage in an FE. A lot of the stuff powered by FE's these days are race cars or limited use stuff. Even though the oil isn't dirty yet, storage considerations come into the equation. The race car, my boat, quads, dirtbikes, etc. I change the oil before I store them for the winter so that they don't sit relying on the anti-corrison and dispersion additives trying to keep whatever may be in the oil from the last time I ran them from causing problems all winter.
The other thing I find funny, especially reading on the internet, is people who talk about long oil changes generally only owned the vehicle for a few years. They might have put 100k on it. Not a good endorsement of your super wizbang oil as I've seen engines go 100k with ZERO oil changes (hey, the salemen told me it didn't need service for 100k miles. Yep, that happened). Now, keep something for 10-15+ years and 250k+ miles and see how well those 10k mile oil changes are doing.