I had around 250 on my old Twitter but then I realized I have no need to keep using this and I just never logged in again. I honestly cannot remember my details anymore.
My lowest account: twitter.com/theweaver9 I have 10 accounts with this being the lowest. About 800k followers in all. It's not too hard if you know what you are doing.
I have about 12,000, but by tomorrow it will be 13,000, as I just bought seeds on Twiends. You have to know what your followers demographic is, and what they like. For Twiends, I'd say they lke helpful info on SEO, and site promotion methods, as well as general entertainment, and hot news and gossip.
I have about 1300 followers in 3 month, it come from my personal tweet. But I think the numbers of followers is not important, the quality of the follower is much more important.
i've 800+ users n my profile is almost 1.5 year old. i usually update my statuses n publish my blogging links or some thing interesting i find over internet