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Are you sure that you get only 20 tweets? GetUserTimeline gives last 100 tweets, if you want, pass count=x, where x is number of tweets you want. Or am making a guess here, the user you are trying connect only has 20 tweets in his account.
see the link http://nullege.com/codes/search/twitter.Api.GetUserTimeline?fulldoc=1
Source:stackexchange.com