According to the search results, Mahalaya marks the end of Pitru Paksha and the beginning of Durga Puja for Bengalis. Therefore, Durga Puja comes after Mahalaya. The next day after Mahalaya marks the beginning of Sharad, heralding the 10-day Durga Puja festival. The dates for Durga Puja vary each year, but it usually begins seven days after Mahalaya.