[null and void]

I'm sure it dissipates over time, but that could take years.

Centuries to millennia.

Not much in the way of atmospheric drag in space...

[DoughtyOne]

Gravitational pull puts a drag on it though doesn’t it?

If we’re talking about near earth orbit, 50-100 miles, don’t the items drop relatively quickly, a year or two?

I honestly don’t know.

[tet68]

Something to think about is that if you have a missile
that can target a satellite, it can also target a missile
you have sent up to capture a satellite.

Capturing one would tell you a lot more than blowing it
up.

[DoughtyOne]

12). How long will orbital debris remain in Earth orbit?
The higher the altitude, the longer the orbital debris will typically remain in Earth orbit. Debris left in orbits below 600 km normally fall back to Earth within several years. At altitudes of 800 km, the time for orbital decay is often measured in decades. Above 1,000 km, orbital debris will normally continue circling the Earth for a century or more.

http://orbitaldebris.jsc.nasa.gov/faqs.html#12

More space debris questions:

http://orbitaldebris.jsc.nasa.gov/faqs.html#top

[SaveFerris]

Heating up the atmosphere actually helps that. When the Sun does some of its special activity.

[SaveFerris]

LEO I mean.....