Hi @Tach 

For ServiceNow Personal Developer Instance (PDI) reclamation, only explicit, direct user logins to the instance reset the inactivity timer.

Activity generated through inbound API calls, automated integrations etc does not count as user activity.

Keeping PDIs Available for Active Builders: Upcoming PDI Reclamation Changes

As per above article , 

reclaiming PDIs that meet both of these conditions: 

• 90 days or older (based on when they were provisioned) 
• Haven't had a PDI login in the last 10 days