how long will it take to make 1 bitcoin with $100 of hardware?

[Cluster2k]

The days of mining are over.  Nobody does it any more.

[jermwerty]

So lets take that $100 and buy TWO ANTMINER S1s off eBay.

That would get you 400GH.  Make about 0.13 BTC per month.  So in 8 months you'd have made a BTC!

BUT...

You'll spend say $50/month on power with say a bit over $0.09 per KWH power.  So it costs you $400 + $100 = $500 over the next 8 months.  (if diff change is 0)

Congrats!  You just spent $500 to mine 1 BTC!