Hi,
This is Mia from the HubSpot Community team. I’m marking this idea as delivered as the current association limit for custom objects is 50,000 records.
See our product and services catalog for the most up-to-date information on technical limits.
If you’d like to request an increase to the 50,000 limit, please upvote and comment here: https://community.hubspot.com/t5/HubSpot-Ideas/Increase-Association-Limit/idi-p/943077
Thanks,
Mia, Community team