On average, how long does it take for a car to relearn it's fuel trim?

I did a battery/pcm/ecm reset 2 months ago and had noticed that after a reset, my car goes through gas ridiculously fast. I'd say it would use up 5 gallons in 60 mile drive (9-10 miles to and from work in 3 days)

It eventually goes away, but by then I've gone through quite a bit of gas. I've done another reset since then and its the same thing. Just wondering how long it usually takes to relearn the fuel trim and if there's anything I can do to speed it up.

My car is a 2004 Ford Explorer 4.6L

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