Use case
Return the sum of the original estimates of the linked issues of the current issue linked with the "is blocked by" issue link type in hours.
Expression
Create and configure a Smart field using this expression in General parsing mode:
%{sum(append(fieldValue({issue.originalEstimate},linkedIssues("is blocked by")),[0]))/60}
If the resulting number from the expression contains too many decimal numbers, feel free to select one of the available display formats or to configure it manually.
