Plea bargaining exists so that an accused who is willing to plead guilty in exchange for a lighter sentence does not have to sit through a full trial, and so that courts are not clogged with matters that could otherwise be resolved early. For that logic to work, the accused has to invoke the process soon after the charges are framed, not years into the trial once most of the court's resources have already been spent hearing evidence.
That is why the BNSS, 2023 fixes a specific outer limit from the date of framing of charges: the accused must apply within 30 days. This period gives enough time to take legal advice, understand the charges, and decide whether a plea bargain genuinely serves the accused's interest, while still keeping the option tied to the early stage of the case rather than letting it linger indefinitely.
A shorter period, such as seven or fifteen days, would not leave enough room for that consultation and negotiation to happen properly, and a longer period, such as sixty days, would undercut the whole purpose of an early cut-off by allowing the application well after the trial has moved on. Thirty days is the balance the statute actually strikes.
So the accused must apply for plea bargaining within 30 days of the charges being formally framed.