My zaps are sent, reconciled, and reported "complete" to my client in sec of less. That's using my node as my Lightning wallet. But if I use Minibits, it can up to 7 or 8 seconds. So I think it depends on the specific wallet you're using, and how quickly it can reconcile and report back to the client. I'm referring to NWC connections, BTW. I don't know how long it takes if an external wallet is called from the client app but I suspect it would longer from start to finish.

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But that's a bit different than what @calle said. You are using minibits possibly over nwc as a lightning wallet to zap over lightning. That's slow, because you added a Nostr relay in the middle, while the lightning wallet is still slow. @calle was mentioning the case when you send the ecash note directly over nostr. That's literally one https request.
Slightly longer processing of Minibits NWC is as well due to the need to transport incoming nwc command over the (double) encrypted push notification and process the payment directly on device where the ecash lives.