Question : Is there an alternative to Liverpool John Lennon Airport (LPL) for getting you to Frankfurt?
Answer : Departing from Liverpool John Lennon Airport is not the only way to get to Frankfurt Airport. Try looking for flights from Manchester Airport (MAN) as well. Over the upcoming two months, flights from MAN to FRA are being booked 79% cheaper than flights from LPL to FRA. Being only 24 miles away, it's easily accessible for most.
Question : How long do most people stay in Frankfurt?
Answer : Of course you're not most people, but if you were, you'd stay roughly two weeks.