Why does Windows update take so long?

Hiya.After i've logged off my laptop the message about Windows update installing 1 of 1 appears.It says that my pc will shut down automatically & not to unplug it etc. I left it this evening & came back to it about 90 minutes later & the update was still going on.Is this normal for an update & how can i speed... show more Hiya.After i've logged off my laptop the message about Windows update installing 1 of 1 appears.It says that my pc will shut down automatically & not to unplug it etc.
I left it this evening & came back to it about 90 minutes later & the update was still going on.Is this normal for an update & how can i speed it up? Or do i just let it download the updates for as long as it takes?It's really annoying!
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