The only reference to flash timing I can find in the manual is shown below for you, also here is link to manual :
I hope it helps !
http://www.uniden.com/products/productdetail.cfm?product=TRU8885-2
If you have Call Waiting service and a call waiting
tone sounds while you are on a call, press
talk/flash
on the handset or
flash/find hs on the base to accept
the waiting call. There is a short pause, and then you
will hear the new caller. To return to the original
caller, press
talk/flash on the handset or
flash/find
hs on the base again.
Setting the Ring Time
Ring Time allows you to set the number of rings the caller hears before your
answering system plays the outgoing message. You can set the ring time to answer
after two, four, or six rings. If you enable the Toll Saver (TS), the answering system
picks up after two rings if you have new messages and after four rings if there are
none.
1) Enter the Answ. Setup menu, and then the Ring Time
submenu (see "Entering the Menu" on page 16).
2) Press
volume up/down to select a Ring Time (Toll
Saver, 2 Times, 4 Times, or 6 Times).
3) Press the
OK soft key. You will hear a confirmation tone.
Setting the Record Time
Record Time sets the duration for recording the incoming messages. You have three
record time options. The options "1 minute" or "4 minutes" set the duration for
recording the incoming messages. "Announce only" answers the call but prevents
the caller from leaving a message.
1) Enter the Answ. Setup menu, and then the Record
Time submenu (see "Entering the Menu" on page 16).
2) Press
volume up/down to select Record Time
(1 Minute, 4 Minutes, or Announce Only).
3) Press the
OK soft key. You will hear a confirmation tone.
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