I just read The Long Halloween - what next?

[Speed Force League Unlimited]

When I got the Long Hallowe'en I flipped through the pages just to see the design of Batman's trunks, cause in that story costume in Arkham Origins video game Batman has boxers trunks.

[nepenthes]

And immensely enjoyed it. Are the sequels worth my time? What story lines/comics coincide with TLH?

As other have mentioned, Dark Victory is more of the same and Hush is like it's louder, sexier, more colourful sister.

Other books you might want to check out
The Black Mirror, Joker dark, broody, street level crime-noir
Ego and Other Tails a similar Animated Series meets Golden Age vibe to TLH
Batman Eternal picks up the Falcone family; the TLH/No Mans Land/Knightfall of 2014
Zero Year a recent modernisation of Batmans origin feat Joker and Riddler

[brucekent12]

I really enjoyed Dark Victory as a sequel. Catwoman was meh. Hush was good, though an entirely different story. Lees art was also good.

[Carabas]

I really enjoyed Dark Victory as a sequel. Catwoman was meh. Hush was good, though an entirely different story. Lees art was also good.

The entire plot of Hush can be summed up as "Here, look at Jim Lee's art. Isn't it pretty?"