My memory tells me it was 6 minutes.
I'm trying to figure out if "he was saying it all along" is a good argument. On the hand, if he is innocent, it means he really thinks it is important. If he's guilty, he picked a straw to grasp at and is holding on for dear life to it.
If he was going to make something up, if he was specific at all about who could have been on his property at the time, he could have introduced reasonable doubt.
The disappearing blood is such an out there claim to make up and hold on to so much, especially considering how little anyone cared about it.
The "smells like smoking thing" could indicate a pattern. Maybe someone frequently lurked around Steven's trailer for whatever reason. Looking for some loose change, *advertiser censored*. Cigarettes. Or just being a nosy-Rosey.