welcome to srp

this set you've linked to looks like all the other junk razor-shaped objects that are not capable of shaving. to me they look the exact same thing with just a new brand name put on them every so often.

paddle strops work just as well, actually they remove at least one more thing that a beginner needs to master - keeping a hanging strop tight.

how long can you keep your razor going? from 1 shave to hundred shaves depending on how well you execute the stropping itself, how good is your shaving technique, how good is your beard prep, etc...

unless you screw up the edge right away usually several weeks at the beginning (say 4-6), and longer later on. keep in mind that regaining the edge on a razor that was properly honed is immensely easier than making it shaving sharp to start with.