I'm getting feedback in both directions on that point. nostr:npub10000003zmk89narqpczy4ff6rnuht2wu05na7kpnh3mak7z2tqzsv8vwqk wants 3 seconds. I want more than 10 seconds (like you). This is exactly why it is a setting: Setting> Posting> Undo Send (seconds).
Discussion
Great, thanks!
The setting is useful, thank you.
My preference is only related to the fact that currently the just sent note is hidden, and I cannot post another note in the meantime.
Probably a good general solution could be allowing undo in place for 3 seconds (enought to spot basic errors) showing the note, then show again the compose area and let the user to undo until X seconds accessing "My notes", where he can find a button for every "sending" note.
In the sidebar we can show if there are email being sent, clicking the component would bring to "My notes".
My testing today indicates I can post another note immediately. I have notes posted within 6 seconds of each other while the delay was set to 10 seconds. I'm not sure why you aren't able to but it certainly is not supposed to run that way.