until what time we can trade without call & trade charges
Call & trade charges are charged under 2 circumstances. One is when you call the zerodha dealer desk and place an order & it gets executed, & the other is when you place an MIS order & don’t square it off by 3:20 pm [25 mins before the market closes in MCX, generally 11:05pm].
The same applies to CO & BO orders although they are sometimes squared off a little earlier, maybe by 3;10 pm, generally notified in Kite if they do.
So to answer your question if you square off your intra day positions before the cutoff time you will not be charged call & trade charges.