Banknifty weekly options ki lifespan kya hey. I mean DOB And expiry?
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Expiry is weekly, ie., every Thursday unless shifted due to holiday etc.
Options do not have a DoB, but get activated as the 3months window opens.
Then it depends on the OI.
BN expiry that coincides with Nifty tends to have most OI far out in time compared to other weeklies.
This is only for BN.
Nifty for example has options enabled for even 2020 dates.