No, you will not get any buy limit against settlement holiday’s credit. As per SEBI regulations and Jainam’s RMS policy, 70% of the delivery sell amount is made available on the same T day of a sale transaction. However, if the stock is sold on settlement holiday, then such delivery selling credit cannot be used to purchase on settlement holiday in any segment.

 
For example, if a stock is sold on Thursday, which is a settlement holiday, then such sale credit cannot be used to purchase again on the same day, i.e., Thursday.

You can see the list of settlement holidays here.