help for monitoring a CPU abnormally charge following lasting conditions

hi I use the search below in order to monitore the processes which use more than 80% of CPU index="TUTU" sourcetype="perfmonmk:process" | where process_cpu_used_percent>80 But I want to monitore only the processes > 80% of CPU which last at least one minutes or more and to display it in a timechart could you help me please?? thanks