"He was reading the letters from twelve to four."

Translation: Četl ty dopisy od dvanácti do čtyř.

[alback-isback]

"četl dopisy od dvanácti do čtyř" je zde předložka "ty" doopravdy z pohledu češtiny nezbytná?

[VladaFu]

ano, jinak je to jen "He was reading letters"

[MaarikaVaa]

Is it possible to say "Četl ty dopisy od dvanácti do čtyřech hodin"?

[VladaFu]

Yes. It is a bit colloquial.

[MaarikaVaa]

Thank you again for your help!

[BoneheadBass]

Is it possible to use 24-hour time ("do šestnácti") in a sentence like this?

[VladaFu]

It is. It is less common in informal communication.