How long cooling period for spikes?

[utah]

I was reading in the October issue of "Orchids". It mentioned cooling the phals at night to trigger flowering (into the mid 50s). Okay, I moved them all but am wondering how long I have to leave them in the unheated laundry room under lights?

I'd really like to enjoy my babies other than just when I'm folding socks.

How long do I need to cool them in the evenings before they set buds (they haven't even spiked yet)? Will they build life-long attachments with the laundry soap and mope around when I bring them back into my bedroom?

What signs should I look for when they are ready to immerge again from "time out"?