Since I started dosing, it's been about 1 1/2 - maybe 2 weeks before I started seeing significant drops. I dosed ammonia last night and am expecting to have to dose again tonight, it's dropping really fast and the nitrites are spiking which is good, just waiting for them to drop now and will return to this thread when they do.
I did seed the filter with media from my 10G to help push things along.
I have a 55G, using a Fluval 405 Canister. I also have a bubble wall for extra O2