MNI Queries

Hi Team,

we have notice below observations, please check and let me know if I missed anything,

• When we used  Sub-Process as asynchronous and running more than 1000 instances but those instances are not deleting even though  we have selected Allow more than 1000 instance check box....is there any limitations ? 
• when we used start process smart service  as asynchronous / synchronous way using MNI with 1000 instances then we have notice that even though we have selected Delete previously completed/cancelled instances. check BOX but those completed instances are not deleted in the monitoring dashboard....is there any limitations  ?.
• and in start process smart service we are unable to run the MNI more than 1000  instances ..if have run more than 1000 instance same like sub process asynchronously. How to achieve this scenario with using batch job ?

thanks!