Depending on which state you are in, banks could remain closed for as many as 4-days later in March. However, not all states would have 4-days holidays.
Certain states like Maharashtra would have holidays on March 24 for Holi, while the subsequent day March 25 is Good Friday and a holiday across the country, while March 26th is the 4th Saturday (banks are closed) and that is followed by March 26, which is a Sunday.
There are reports that there maybe a strike immediately after that. It is not certain whether it would be across banks. The United Forum of IDBI Officers and Employees, representing the 32,000-strong workforce in IDBI Bank, will observe a one-day strike on March 28 according to news reports.In any case, it is going to be a long list of holidays.
To check a list of bank holidays, in every state in India click here