Although it is always hard to get an accurate assessment, how many times would you guess you have read through the entire Bible?
This should be based upon reading programs -- whether from Genesis to Revelation or some other schedule -- in addition to personal guesses.
For example, if you preach/teach through the Word, you might be reading through the entire Bible doing a survey course, etc.
Many of us have certain books or sections we have read through more often. Most of us have probably read through the New Testament many more times, for example. But use the "least read" book for a template.