That should be 2.5 million light years - with an order of magnitude error of only one million times maybe looking in your jeans in the wash wasn't such a bad idea.
Here in the Southern Hemisphere we only see M31 low on the northern horizon underneath Pisces for a brief time each year. It is quite a challenge to spot it. But then, in Sydney these days they call the Southern Cross the Southern Triangle because the fourth star is so hidden by light pollution.