"Gab" is nice, but can you charge for that time? Is this time the customer can afford too?
When you write down "get the customer in, designed, and out in the least wasted time", it may sound harsh. But it's what is needed.
Talking during the design time about Johnny smacking that triple home run on clean-up, can lead to a "gee, I hope you got a great picture of that, along with the game ball?"..... IE: the next frame job that they may never have thought of. But if you find that you have been leaning on the design counter for the last 10 minutes.... that is burning shop time.
I know this as fact... It's my biggest down fall and requires a constant tending.
As a one-man shop, you can just work a little overtime to get the work made-up. You may even be successful at it. But if you're successful at it, you may end up taking on an employee or six. Now when they start emulating your habit, how will you censor them?
A magician calls it "patter", it's the dialog that keeps the misdirection going, but also keeps the tempo of the trick.
Stand next to a craps table that is dead and listen to the stick mans talk.. nada. Now go stand next to a full crammed hot table...... that guy never stops talking: "baby needs new shoes = twos, farmer in the field = hot field, etc" and if you listen the guy who sounds more like an auctioneer.... he's talking about the car not working, his dog running amoke, the girl who dumped him........ it's really funny... and when you start chuckling, and your in his line of sight but even 10' back.... he'll look up and acknowledge you with a little smirk and wink. And you just got confirmation that he was 100% "on the job".... not only the table, but who was around and acting how.
Education, how ever slight, can be a very powerful tool in sales. It conveys to the customer that you are competent, and experienced and they become more comfortable in following your lead. It can be as innocuous as looking at a religious icon-ish picture and grabbing that 3" ridge scooped high back deeply aged gold honker saying "This seems to call out for an early Renaisance frame . . . we could even print transfer that poster to canvas with a protective film bonding on the front that would give it that 'painting' look and frame it without glass or mats."
Much more powerfull than "This big expensive goldish frame has that old timey look to it."
The faster the customer feels comfortable about your designing, the faster you can ask for that sale and close the deal. Then if they want to linger and gab, it's on your time..... but you just got paid.