Yes, you can use Pluskantor.pl┬á24 hours a day 7 days a week. You can make transactions and operations whenever you want, also during weekends and festivals.
However, in non-working days you can transfer money only using BZ WBK and PKO BP. Practically if you make incoming transfer on Saturday or Sunday from BZ WBK (previous Kredyt Bank) or PKO BP (previous Nordea Bank) your funds in couple of minutes will be available in Pluskantor.pl. You can order to exchange funds. If you would like to exchange money immediately please choose best possible exchange rate.
The rest of banks integrated with Pluskantor.pl: Alior Bank ( and previous BPH SA), PEKAO SA, mBank group (BRE Bank, mBank, MultiBank)┬áand Reiffeisen Polbank┬á ÔÇô transfers are made with the date D+1, which means that they enable quick transfers only on working days. It means every order of withdrawal form another banks than BZ WBK (previous Kredyt Bank) and PKO BP (previous Nordea Bank) will be qualified on the next working day.