Thank you, Margaret and Barbara
I have no idea how long the bulbs have been in the pot. I picked them up from Florida in February of 2013 and they were all in a single pot, but I remember there being a decent amount of green, so maybe 2-4 large, blooming-size bulbs at the minimum?
I have a picture of the 3-4 amaryllis that bloomed last year (around Dec. 2014/January 2015) somewhere. I'll pull it up and post it here when I find it. :)
Early this year (March/April) they were clearly overcrowded and I repotted probably 8-10 bulbs and left atleast 5-6 in the pot (with unknown quantities of tiny ones). If they roughly double each year....maybe that confirms I started with about 4-6 big bulbs?