haha, we call it the zoomies...and it NEVER ends *evil laugh*
for us it usually occirs about 10-10:30 pm at night (yup right before bedtime) and lasts anything between 1/2 hour and 45 mins on average. at which point they run round crazy talk alot (dodger is a talker) trow things about and generally zoom and crash into walls or table legs...or people legs...lol
we find it quite comical to watch, especially since my parents 3 yr old spaniel also gets the zoomies. around the same time.
its very normal, however the only rela way to combat the zoomies and lessen them is to make sure he gets LOTS of excersize during the day... my kids go out for a 1/2 hour outside playtime most days and 1 hr one day a weekend. and they still get the zoomies...
id try and sit back and enjoy it...lol its quite funny to watch.
hell probbaly start mellowing around 5-6 yrs old but even that mellowing usually isnt too much, these little guys dont realy slow down much untill there teens...and your looking at a lifespan of somewhere around 25 yrs with these little guys if not more...so they take a little longer to slow down