Sounds strange.. look like something on the machines ping...
Just checked on my solaris 8 :
root(sun58)# time ./check_ping -H 192.168.10.48 -p 10 -w 2000,20% -c 3000,50%
PING OK - Packet loss = 0%, RTA = 1.00 ms
which is correct. as the time between the first and the last packet is 9 secs...