They're screening "The Wizard of Oz" again for the umpteenth time.umpteenump‧teen /ˌʌmpˈtiːn◂/ det informal 
There seemed to be umpteen rules and regulations to learn. She’d called the apartment umpteen times, but never got an answer.—umpteenth adjective: They're screening "The Wizard of Oz" again for the umpteenth time.
COLLOCATIONS FROM THE ENTRY They're screening "The Wizard of Oz" again for the umpteenth time.
very many – used especially when you are annoyed there are so many: They're screening "The Wizard of Oz" again for the umpteenth time. There seemed to be umpteen rules and regulations to learn. She’d called the apartment umpteen times, but never got an answer.—umpteenth adjective: They're screening "The Wizard of Oz" again for the umpteenth time.