many's the (something)

many's the (something)

There are or have been many such occasions or instances that occurred on or in a particular hour, day, evening, etc. Many's the evening I've thought fondly on my time as a teacher in rural Japan. When you're young, many's the hour you spend playing with friends, blissfully ignorant to the troubles of the world.
Farlex Dictionary of Idioms.

many's the

— used to indicate that something happens often.
2000 Taxi News Many's the happy hour I've spent listening to cabbies thrash that one out.
Farlex Partner Idioms Dictionary
See also:
  • many's the
  • of a morning/afternoon/evening
  • thank you for a (some kind of) evening
  • thank you for a lovely evening
  • thanks for a (some kind of) evening
  • kick up (one's) feet
  • (as) plain as day
  • plain as day
  • kick (one's) feet up
  • get squiffy