Also helpful would be the current occupants of the tank, pH and Temperature. And the nitrate level is helpful as well.
The plants won't stall the cycle, although if you have a LOT of them, you might never have a cycle (nor the need of one) as the plants remove the ammonia as fast as it is produced. In that case, tho, you would not even see nitrites.
Low temp. will prolong the cycle as the bugs grow slower. How long is it since your ammonia spike? In my unheated tank, it was 4-5 weeks after the ammonia spike that I had a nitrite crash. So, you 63 days is not that far off (esp. in the middle of a Winnipeg winter! 8O)
80 gal FW with 30 gal DIY wet/dry/sump.
9 fancy golds, 1 hillstream loaches, 1 rubber-lip pleco (C. thomasi), 3 SAEs, small school of white cloud minnows, planted.