Trying to help my marraige, How long should men last?

Ok, normally I wouldn't put this type of subject in a forum but I'm doing so to help my marriage. My wife and I have been talking about how long men last. I would like to get some info from some honest guys or women. When your having sex what is the average time that your able to go until you come? Sorry if this is to specific of a topic. I'm just trying to figure out if I should be lasting longer than I do. My wife doesn't say much about it but I can tell that it dose bother her. I'm 33 years old and I have used Ciallis to try and help with this topic. Thank you for any information you can give.

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