Welcome to Orchid Board Oakrose
Most of that sounds normal. Odd weather (temps going up and down) can cause blooms to last longer, or not as long, or be early or late... basically the temps and daylight can cause all sort of odity with the blooms.
I have ones with buds opening slowly and other flowers on the same plant wilting this year. Again I think it's down to cold days and really warm days and the weather not really knowing what it's doing.
The longest I've had a phal hold the same blooms is 6 months. Your one holding the flowers longer must be liking the conditions, but it's quite possible for them to hang on a long time.
They can easily grow spikes, roots & leaves all at the same time if they are happy. I have ones that are doing that. Again weather can play a part, if the spikes are set late in the autumn, or if a cold spell causes them to set in the spring (or other time of year). Generally they grow from spring to Autumn (most in the spring) and colder weather triggers spikes to start, but cold spells at any time of year can trigger spikes.
The last one is the only one of concern I think, and it sounds like you've already got some advice on that. There should be lots of information around here on how to try and recover it, but just ask if you need more specific advice on it