The onstat -g ntt option prints network user times.
IBM Informix Dynamic Server Version 10.00.UC1 -- On-Line -- Up 01:57:44 -- 101376 Kbytes
global network information: #netscb connects read write q-free q-limits q-exceed alloc/max 3/ 3 0 0 0 1/ 1 135/ 10 0/ 0 2/ 0 Individual thread network information (times): netscb thread name sid open read write address c76ea28 ontape 61 14:34:48 14:34:50 14:34:50 c63e548 tlitcplst 4 14:30:43 14:34:48 server.ibm.com|5006|tlitcp c631028 tlitcppoll 3 14:32:32