Tonight as an experiment I made one large size 9 scenery tile
Hello Michael,
regarding the duration of tile generation, I made a benchmark for you.
Area: Birnigham (no water tiles) Size 9 with 2.3m resolution.
Specs: CPU I7-6700K @4GHz, SSD+SSD, 32GB DDR4 RAM, GTX 1070, 100 MBit Internet Access
Downloading: 4min 30sec (with average 0.75MByte/s)
Stitching: 1min 30 sec
Geoconvertion 9,10,11,12: 17 min
Geoconvertion 9,12: 6.5 min
Geoconvertion 9,10,11,12: 7min
Please see the caching effect of conversion 2 and 3. (I did not close Aeroscenery between them)
So it seems, that the additional time for tile 10 and 11 only adds a small amount to the conversion time.
This also gets clear when you look at the count of tiles depending on level:
Lev9 = 1 tile
Lev10= 4 tiles
Lev11= 16 tiles
Lev12= 64 tiles
I did not convert Lev13 with 256 tiles, though that would be adequate to 2.3m resolution.
The tile count increases by 2x2 from step to step.