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I usually set them up with delayed n auto reset at 9.6 sec I think is the closest to 10 sec.
I go a little longer than that and here's why. All of our FD's in our county have two two-tone pairs for dispatch which eats up at least 8 seconds of air time. If the dispatcher blows the EMS tones on the the EMS channel first and then the fire tones on the fire channel, that is at least 8 seconds of carrier drop on the EMS side. Add in a second or two for dispatcher drop and the 9.6 may not be enough to keep the SV going on the EMS side. If dispatch sends out the fire tones first and then the EMS tones, the time gap is much smaller for the fire pagers and nothing gets missed.
For non-SV pagers, this is important for the Delayed N choice. SV pagers would utilize the Revert N reset. I've had good results with the 10.56 second setting so far.
Now, if your dispatch does it all on one channel, the time may not be so critical. And if all the tones are single pairs instead of a chain of two or more pairs, again it may not matter so much, even in multi-channel dispatch.