Hi @RC Pili
'Time to resolution' is the default SLA defined in Jira Service Desk. If you are using Jira service Desk , It should available in JQL, below is the example usage. Else if you are not using Jira Service Desk, this function will not be available in JQL.
Project = "Project name" AND "Time to resolution" <= 24h
Please let me know, if you need further clarification. Thanks!!
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