I've timed several 8 hr LSF slope flights and 1 flight over 8 hours that
was Thermals. Gary Itner did it about 20 years ago with his 16', 3 ch.
XC sailplane. There have been longer slope flights but no one has done
more than 8 hours in thermals in this country with the possible
exception of Wurtz on his WR X/C flight.
Long TD flights are no fun after a couple of hours. And they are
certainly not easy.
JDK
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