Today I (Jonny) taught in Khmer for the first time ever. A twenty minute talk took the best part of a week to prepare.
It appeared to go quite well. I asked for feedback after the event and one member of staff said they understood 90%, another said 99.9%. Whilst I appreciate that they may just be trying to encourage me, I was still delighted.
Anything higher than 50% well exceeds anything I ever achieved back home in English!