Some of these ferries don't run everyday, so we could narrow it down further.
Bari to Durrės (10pm departure) (Albania); Igoumenitsa, Corfu, Patra, Sami (no service on Thursdays), Zakynthos (no service on Thursdays) (Greece); Dubrovnik (10pm departure) (Croatia); Bar (Montenegro) (no service on Thursdays)
Salerno to Tunis (no service on Thursdays) (Tunisia)
Brindisi to Sarandė, Vlorė (Albania); Gaios, Igoumenitsa, Corfu, Patra, Sami, Zakynthos (Greece)