An endless job. Something that is routinely undone and, therefore, never progresses

I've been working for days and days on my political leader's final election campaign speech, but every night he tells me to do most of it over again. It's becoming my Penelope's web

Sto lavorando da giorni e giorni sul discorso di chiusura della campagna elettorale del mio leader politico, ma ogni sera mi chiede di rifarne una buona parte. Sta diventando la mia tela di Penelope

My work is something like the Penelope's web, never done, but ever in hand

Il mio lavoro è un po' come la tela di Penelope: sempre in corso, ma mai finito

From The Odyssey: Odysseus, king of Ithaca, is believed dead at war and his wife Penelope is expected to choose a suitor among the young nobles of the island. Trying to put off her marrying again, she promises to choose a suitor after she finishes weaving a burial shroud for Laerte, Odysseus's father. For three years Penelope weaves in the daytime but unweaves part of the shroud during the night, until a slave discovers her trick and reveals it to the suitors