Logging query plan for queries

when i enable debug_print_plan and
debug_pretty_print...
query plans are written to log file for all
queries....(3 gb of logs in 3 mins) which is of course
diffcult to analyze and consume too much resources....

is it possible to log plans for only the queries whose
duration was more than a particular value or something
like that... (e.g. log_min_duration_statement)....

thx
Himanshu

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