First question : Are you using the right wrench? If you are using an SAE ( or wrench with fractional inches on it, such as 3/8" 7/16") then you definitely are using the wrong wrench. Maxima will be all metric. If you are using a crescent/adjustable wrench... you might want to rethink things as they have a tendancy of being useless for most fasteners with any torque on them at all.
Second: If the wrench is metric, and you are sure you've selected the right size, take a flashlight and evaluate the head of the bolt. If it looks rounded off, STOP and take it to a mechanic. There are multiple ways of getting out a rounded bolt, but it is FAR easier for an amateur mechanic to just take it into a shop. Why do I say this? My friend rounded off a bolt on his oil pan. We spent 6+ hours trying every method we knew of to get it off, and finally a mechanic had to take a bolt extractor drill bit ( $10-30 ) to get it off after 30 minutes of filing.
Third question: If the bolt head is fine, and your wrench fits snugly, then continue to turn. My guess is at least 5-10 full turns to get it out, but could be more.
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