How long should updating firmware take?

should it take more than 45-60 min?  

Mine took about 20 minutes but that didnt include a restart

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 ok i guess im stuck on FW 3,   I tred a restore and the reset button.  its get stuck at 100% after 20min then stays there for 12 hours… I reverted from FW # 4 a few weeks back.   I must have messed something else in one of the edited files.