WG2Z (5600km) was the first USA station to spot my 500mW 10m WSPR beacon today at 1302z. I see that FR1GZ (9724km) on Reunion Is, South Indian Ocean, has already spotted me a couple of times already on 10m WSPR today!
UPDATE 1728z: KU4QI (6406km) was the last to spot my 500mW 10m WSPR-AXE-CW WSPR beacon at 1708z. There is still a chance others will spot me later.
UPDATE 2110z: The last USA station to spot me was K9AN (6505km) over an hour later at 1838z. It all depends who stays around and who is active! I was surprised.
UPDATE 2140z: I went QRT on 10m WSPR at 2112z. I have now QSYed to MF for the night.