Looking for some sanity check nos around bid ask prices

I’ve been trading Nifty/Bank Nifty and also some times stock options. The indices are mostly liquid, but ATM Calls and Puts or even 1 strike above or below ATM on large stocks even like Trent seem to have a spread of over 4 - 5 Rs at times.

I figure that sometimes there is liquidity in these stocks and sometimes there isn’t. My question is

  1. What kind of sanity checks should someone have while trading options and what kind of bid-ask spreads do you guys consider if you are option buyers. For ex in stocks, say the spread is more than 3 Rs - do you avoid? Any rules or heuristics around this would help me think this through better

  2. Sometimes in a matter of minutes if a breakout happens previously illiquid options become liquid - so I am also not willing to completely ignore certain strike prices - curious how you folks manage this

Any practical advice will be appreciated! Thanks