How quickly does Nitra-Zorb work?

I bought a bag of Nitra-Zorb (absorbs ammonia, nitrite, and nitrate)
to make things a little bit easier on the fish I'm using to cycle my
55G tank. However, I haven't really noticed any difference in nitrite
and/or nitrate levels since I put it in about a day and a half ago.

Roughly how quickly is Nitra-Zorb supposed to work? I'm currently
hovering around 1 or 5ppm of Nitrite (the test kit is really hard to
distinguish between those two values ... the rest like 2ppm 3ppm, etc.
are easy to tell apart but 1 and 5 ppm are not). I think the purple
color on the test kit has become ever so slighly less intense since I
put in Nitra-Zorb. The NitrAte levels seem to be howevering around
10ppm with not much change noticed. Ammonia was 0 ppm about a day or
two before I started using Nitra-Zorb.

Does my experience sound normal ... or is Nitra-Zorb supposed to work
way quicker? Was I maybe supposed to "recharge" it in warm salt water
before using it for the first time (manual only said you had to
recharge it after 5 days of use)

Thanks for any input you can provide,
Harry