Calculating span margin benefit

#1
When we sell Bank Nifty call 31000 we are charged span+exposure margin of ~ 83000 and when we add a counter position say a long 31100 call, we get some margin benefit

How this margin benefit is calculated ?

My second question is that we also get margin benefit in calendar spreads, but that is revoked when near month has 3 days left on expiry, how would that work out on banknifty weekly and next weekly expiries ?
 
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