The lake will be relatively high, which means there will be much more flat water than most people would care to row, and you will have a reasonably great probability of headwinds.
Some people are young, strong, have plenty of surplus testosterone to burn off, and 30 miles of rowing against the wind is just their thing. Others have plenty of time and don't mind the drudgery of a long flat row-out. But if you are not irrevocably committed to a no motor trip, many folks would urge you to reconsider. I certainly would...