Dell Studio 17 Problems -- The memory test is taking hours!

Dear Dell Support,

I've been following the instructions you sent and the computer has
been busy beeping loudly and running through tests, all of which have
passed so far.

However, it seems to have been performing the:

"Memory March B test"

for over 6 hours now. The system does have 4 GB of memory, but this
seems like it's taking a long time. Is this normal?

Should I let it continue?

Regards,
Michael Maguire