I verified a machine that ran for 226,186 cycles, which took about two hours on the highest speed.
This machine would in theory run for about 14,000,000 cycles, which is about 5 days. (EDIT: bad math, disregard this)
EDIT: After some better arrangement and some machine-aided optimization, revision 2 has a theoretical runtime of 61,000,000 cycles ≈ 3 weeks.