2 months, with lr and ls, OMG!!!!!!!!!!!
if i had to bet, i would pu tmy money on the lfs being a lil bit offin their judgement, if your tank has 0 nitrItes and ammonia, then i would guess you cycled by now, but then again we all could be wrong, i mean, how often is it that the lfs's are wrong guys?? not very, if you ask me
NOT!,
i have seen and heard of very very few good lfs's that actually know what they are saying, let alone selling, so yeah, i do think it is very possible you cycled by now
but if you trust them and want to be sure, get a couple of chromis, they are very docile and will add color to the tank, and are fairly hearty(actually they are a very docile damsel), them you oculd leave in later too, anyhow after adding them, give it a couple more weeks ot a month before adding fish and monitor your levels
to answer your question, i prefer to cycle using lrand ls mayself, and a close second would be using grociery shrimp, but no fish(not that this question matters anymore)
HTH