Congrats TC (and Brett). A long day in the saddle is very fulfilling. (I daresay Brett is a great escort and motivator)
Now, at the risk of incurring wrath I'll add a bit to the narrative (All Lav related so hopefully I haven't missed the plot!!)
I find it hard to believe that anyone who is a long time Lav owner hasn't done long days such as this. (I am talking about owning a Lav as transport not a toy or investment) I think particularly true if you live in regional areas of Aus where it is a long way to anything.
In the late '80's when living in Townsville I started taking my girlfriend (now wife) to my regular holiday spot which was pitching a tent at Main Beach (Gold Coast) Caravan Park and visiting my old haunts, having worked on the GC for a couple years in the early '80's. (Worth mentioning I avoid going to the GC at all costs these days)
After an education on limiting luggage to a couple of multi purpose non crush clothes, securing the tent and leaving room for her, we would head off for the first main stop, which was a visit to her sister in Bundaberg, a bit over 1,000kms depending which route. (I think once we went straight to my old home town Wondai, but that was around 1,200kms and I think pushed the envelope a bit!!) Always a long day and her biggest concern was she would always drift off to sleep as the day wore on and she would wake up with a start thinking she was going to fall off. (Ahh, the drone of a triple....)
Of course she was sitting on the Jota's hump so perhaps I should have put a sissy bar on as the tent and bags behind her didn't offer too much support but at least she had more padding than me at the front

Those days of long distance 2 up riding came to an end in the new decade ('90's) as marriage and kids came along, so long trips have basically been solo since except for an occasional short dash. (Swapped to long trips in her old Mazda626!!)
I have always considered the Jota a great long legged mount, however I agree with Diablo Loco in regard to the actual road travelled which will dictate to some extent time and distance.
It is probably fair to say that a lot of my longer trips have basically been "point and shoot" so to speak and in younger days long distance was the norm! (One of the big differences between taking a motorcycle and a car point to point back in the day was you couldn't measure the distance by counting the stubbies when on a bike

)
Actually the last 1,000km+ day I did was returning from Sydney in 2017 where I did 1,140kms on the last day which was a pain as I had to detour and change directions a number of times to avoid flooded roads and many roads were also damaged.
The question of age is also an interesting one.
I think once heading into your sixties, for many of us, work will be in the rear view and time constraints not as important so trips will often be more leisurely and offer the chance to looking around more (Loved Marty's analogy re cheesecake

)
I still love to put some decent miles up however I am far more conscious about animals in regional areas in the early evenings and also now take the option to stop and have a squizz at things.
While I would always choose the Jota if I needed a quick long haul trip, longer trips for me these days are limited to a couple of times a year and I really now prefer to ride the AE on relaxing rides, so 600 or 700 kms per day seems enough, although admittedly I avoid heavily populated areas like the plague as I don't think Grimeca and people mix!!
Hopefully the above is taken as intended and I have little doubt the longer days are a bit rarer for many these days as bodies age and remembering many of these Lavs are over 40 years old, so again, good on you TC and I reckon ending a big day on
that bike, would have been a great feeling.