how to check the tcp 80 round trip time if the destination is not pingable

Hi.. If there any way to check the round trip time of one of our destination server IP, the server
IP is not pingable but can be telnet port 80.  Normally I checked the latency using Ping and it
will tell me the latency, but the server can only be telnet port 80

what linux command can I used to know the latency of tcp port 80 or other tcp of my destination ?


 
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