Maximum number of tweets given a specific hashtag


What is the maximum number of tweets that I can retrieve using the REST API v1.1 when I search for an specific hashtag? I am using Twitter4j and I know that we can do 180 queries in a 15 minutes window, but I am only doing at most 40 - 50 when my nextQuery (the attribute that indicates the next page of data) value gets null. I am pretty sure that we have more than 750 (50 queries x 15 tweets returned per query) tweets about #superbowlsunday, for example.