I staying Luxembourg for three days wanted to do a day to trier will that be enough time to spend there.
and how long do you think you need in Luxembourg
One day should be fine for Trier.
I'd also take a second day trip from Luxembourg City, since one full day there should be okay. Vianden, Clervaux or Diekirch (in that order) would be my choices for a day trip.
get an early start - there is lots to see.
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