Huge oval craft with windows and colored lights running along the bottom of it. No noise. Sitting over river.

It was HUGE.  I estimate 3 football fields in length and 3 stories high.  It was sitting still above the tree line at the back of my neighborhood over the Nashua river.  It made no noise.  It had no apparent engines or flames or anything.  It was shiny – the craft was illuminated by the reflection from a full moon.  It was a very clear night.  About where the “2nd” story would be there was a row of what seemed like windows with an ivory light illuminating from them.  All along the bottom were colored lights (various colors).  I worked for the Air Force at the time as a contractor.  I know my planes VERY well.  This was not anything we have.  I held a security clearance at the time too and feared I would loose it if I came forward with type of information.
 I believe I lost about 10 minutes of time.  When I first saw it the clock in my car said 3:00 a.m. and the next thing I remember it said it was 3:10 a.m.
 I didn't tell anyone about it, but the next two mornings in a row my daughter (who was only 6 at the time) said she saw a "Lady" in my room during the night and she couldn't wake me up.
Witness indicates that the date of the event is approximate.  PD