display time for target_print

Recently I have used a couple of long message prints on to players screens and they disappear after 3 seconds. This means the message needs to be fired more than once for the person to actually read the enitire message.

I thought this would have already been a feature as the admin command announce has a time value and the motd also has one, but i have tried a variety of keys on the target_print and nothing has been successful in increasing the display time.

So if i have missed something can someone please tell me? if not i'm requesting a time,x key be added to target_print.