0.0 seconds if you don't have problem with your browsers cache settings....
0.0 seconds If you click on "SAVE"
Oh. Ha, ha.
I understand now. UNLIKE WT's other edit-able pages -- which require a personal okay if a user tries to leave the page without saving their changes -- the View/Edit Badges page does not provide that protection.
I'm glad to know that. I will upgrade this question to an IMP NOTE, on the grounds that inconsistency does not adhere to the Principle of Least Surprise.
Thanks for your comments.