Hard for me to say as I have never gone there, but the default focus times for Voyager (The imaging software I use) are from memory, 3 seconds for broadband and 15 for NB.
It is really a case of suck it and see,Try 15 seconds for the NB filters and see how it goes is the best advice, if it does not detect enough stars (Assuming full field focusing) then maybe try 20 and go up from there.
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