How long should cycling take if I've used things from a previously established tank?

i agree with the person above, but what you should do is grab some of the gravel from the established tank into the new one because benificail bacteria develops within the filter and gravel so that will speed it up even more, from what i heard this process should take about 1-2 days but i geuss either a 55 gallon will take more time to cycle, or because there is no trace of ammonia in the tank, i suggest just putting one of your fishes in there for a few hours afeter feeding and once it has pooped, your gonna see great results.