Not all day but there were three two-hour blocks of them during Cartoon Network's non-Adult Swim programming hours. They were interspersed with blocks of episodes of The Looney Tunes Show and Wabbit/New Looney Tunes. But my cable TV box's guide only listed four titles for each block of Looney Tunes whereas it gives full listings for Boomerang's blocks of Looney Tunes (and Tom & Jerry and Popeye). These are the titles I can remember offhand:

"Rabbit Fire"
"Rabbit Seasoning"
"A Pest in the House"
"The High and the Flighty"
"Often An Orphan"
"A Pizza Tweety Pie"
"Mouse and Garden"
"The Leghorn Blows at Midnight"
"Gee Whiz-z-z-z-z-z-z-z"

There was also, as I can remember, What's Opera Doc?, Duck Amuck, Super Rabbit, Scrambled Aches and, amazingly, Meatless Flyday (a lone one-shot in a sea of big stars). The picture format presented was all over the place, bizzarly (basically the same as how Boomerang usually presents them).

It also looks like the HBO Max Looney Tunes have returned at least for a little bit. Their was a half hour of them at 9:00 AM and right now they are listed as being on again at 9:00 next Saturday. On the guide they are listed as season two. Since I don't have HBO Max I'm not sure that jives but I'm happy to get to see some of these.

Last night I remembered that "Mouse and Garden" was another one that was listed in my cable TV box's guide so I edited my post to add it.

From another source that lingers me, here is everything aired

I: Fool Coverage, The Grey-Hounded Hare, Zipping Along, Mouse and Garden, Stop, Look and Hasten, Foxy by Proxy, One Froggy Evening, Ready...Set...Zoom!, Oily Hare, Beep Beep!, and Guided Muscle

II: Gee Whizzzz, Duck Amuck, What's Opera, Doc?, Often an Orphan, Fast and Furry-Ous, There They Go-Go-Go!, Birds Anomous, Rabbit Fire, Fool Coverage, To Hare is Human, No Parking Hare, Going! Going! Gosh!, and Zoom and Bored

III: The High and The Flighty, Meatless Flyday, Scrambles Aches, Super Rabbit, Stop,Look and Hasten, Hip-Hip-Hurry!, Knighty Knight Bugs, Rabbit Seasoning, Hook,Line and Stinker, Duck Amuck, Bedevilled Rabbit, A Pizza Tweety Pie, Fool Coverage and Lickety-Splat