6S users - proximity sensor delay

Just a quick question -

Can you help me figure something? Place a call anywhere with your phone on a table or your hand. When you place you finger above the earpiece over the proximity sensor, does the screen go black immediately or about half a second or so later after your finger touches the spot?

Thanks a lot. I just got a new 6S and wondering if the proximity sensor is broken or if it's the same for all of em.

 

Because I just got it brand new and I'd like to figure out if the sensor is faulty.

Can you move your finger quickly and place it over the sensor?

 

Anyone else? Barely takes a minute to check.

 

Thanks

anyone else?

 

Thanks