Igor, HOME is incorrect here

ALL DAY LONG puts emphasis on the time it took, and not on what she did. Which is expressed in the Russian?

The time it took. To emphasise the action, it should be reversed: "Весь день она красила дом". However, when spoken, both can be used in both meanings depending on stress.

Aha, makes sense! Thank you)))

she was painting the house. we have a process here

We still say “painted.”The process is expressed by “all day (long)”