By default top runs every 3s.

You can monitor processes greater than PID XXX by using the watch command and top in batch mode (with -b, for 1 iteration with -n 1 and sorted by PID with -o PID):

watch -n 3 "top -o PID -b -n 1 | perl -ne '/^s+(d+)s+/; print if (not $1 or $1 > 5000)'"

Where for example 5000 is my threshold:

Tested on 14.04