how many episodes is tybw cour 1

Cour 1 of Bleach: Thousand-Year Blood War has 13 episodes.

Quick Scoop

That first cour was structured like a short anime season, which is why it runs for 13 episodes rather than a longer standard season. Later reporting and episode listings also line up with the same count.

TL;DR

TYBW Cour 1 = 13 episodes.