Don't know what sensors you have, but I picked up a tapcon (concrete construction screw) in my wheel three days ago. I HEARD the thing in the tread right away so I know where I got it, but had to stop for 5 minutes to pick something up at a store. When I started off again - heading right for a Costco 3 miles away - to get it fixed, the Continental sensors were already alerting and I had a message on the dash about it. I could actively watch the pressure depleting as I was driving.
I made it to the Costco with 10 psi in the tire, only to discover that their "automagical" tire compressor thing in the parking lot DOESN'T WORK if your tire has less than 15 psi in it. They wouldn't fix it unless I made an appointment - so I did, and had to fill it WAY up (75 psi) just to get home so I could plug it myself.
I'm glad I did, b/c at the appointed time, they then refused to fix the tire because "the front tires have alignment wear" (the hole is in a back tire, and NO they don't have uneven wear) that supposedly the genius could point out from 10 feet away from the car. I'm NOT happy with that particular tire department, I've had hit-or-miss results from them before. Oh, but in not fixing my tire, they DID manage to let out the air I had put in, to lower it back to 45psi. I prefer to run sidewall max on my cars. No matter what you tell them, they will ALWAYS reset the pressures, which is another annoyance.
At least the plug I installed is holding.