In my opinion you should take the time, wait in line to sign in, wait for them to call your name and finally hear them tell you to come back after two hours. While this will certainly cause an inconvenience, you won't take the "hit" on your TEP. It will also give you a good excuse to take some PTO and enjoy the whole day doing something in addition to dealing with your Sprint issue(s). After all of the above you will certainly need to enjoy something for your trouble other than a properly working device.
Most are too young to have dealt with the cell industry in its infancy. I, however, was in on the ground floor as a broker to many agents/sub agents. In those days one was covered for any/all issues related to their devices with no need for supplemental TEP's/insurance or costs as the original company (New Vector Communications - a nationwide pooled subsidiary of the "Baby Bells") was simply ecstatic to have any customer, period. An auto or homeowners policy would handle everything at no additional cost. People would point to the new strange looking antennas or someone talking on the phone and think, "WOW!" Now that
"The Man" has figured out how to
squeeze the customer even harder, and one is willing to (or must) pay to protect their investment due to the high cost of the original device or replacing one without activating a new line of service...
For example: Remember when insurance/TEP's would replace up to three devices in a 12 month period and they provided a NEW one (or NEW upgrade) with a deductible of only $25 and FREE OVERNIGHT shipping before they would cancel the coverage? After exceeding the limit, one would have to then wait an additional 12 months before they would reinstate said coverage. Any of the above were scenarios were considered the "good ole days." Now, one is allowed only two devices at a cost of $50-$75 each and then it's a only a refurb. Oh, and let's not even get into what they do when your billing/shipping addresses don't match!
Bottom line is to be wary of ANY TEP or insurance "hits" unless absolutely necessary. ALL providers are now quietly terminating contracts with those users whom they feel even
might be abusing the system, customer service rep's or their service(s). Even those with many contracts and lines of high level services (i.e. A minimum of $125/line)!
I apologize for going beyond your query but for those who aren't aware of what is going on the above info can be quite informative and save time, energy, effort and hassles. Not to mention a permanent loss of service, insurance and/or TEP.
This thread has also allowed me to vent and rant on a personal level. Is this all a "Commie plot?"

"Good night and good luck."