Before the IPA fad kicked off I used to go to a local beer megastore and specifically sample every American IPA because that was the smallest segment that was reasonable to take on in its entirety. It still took me two years to complete. Nowadays it would be impossible with the overwhelming glut of IPAs. Nor would it be very enjoyable since the fad breweries just take IPA as an excuse to overload on hops and destroy any other flavor nuance. Back then there were some true gems to be found that wouldn't even qualify as an IPA today because their hops content was well moderated.

> Nowadays it would be impossible with the overwhelming glut of IPAs

You would never finish. New batches and variants with new names are coming out faster than any one person can try them all, barring maybe a full-time job in expensive alcoholism.