Yes, you can apply for an IPO application on Sunday as well but through an online application. But, you need to keep few points in mind before doing that.
There is no restriction as to when you can apply for an IPO. But do keep in mind that offline methods of applying for an IPO is dictated by the financial institutions or the broker work timings.
Most of the time, Sunday is off, and you won’t be able to do it. However, if you are applying online, then you can do so through ASBA. You don’t have to worry about the timings from the IPO application’s intake (from 10 AM) to the very last day (4 PM); users can easily apply it online.
An IPO remains open for 3-10 days. During this time, stock exchanges allow applications on weekdays between 10am to 5pm. On public holidays and specific days on which exchange is closed, applications might not be accepted.
Though banks and brokers allow applications 24 hours, the exchange will only process between 10am-5pm. In the last couple of days of the IPO, every bank has provided a specific deadline after which it will close the window. The reason for doing this is because banks and brokers have to further process exchanges and that takes a lot of time.
Keep in mind that the application will be processed on the next working day if you apply on a Sunday.