Even though it's an ale, and generally ferments at a higher temperature, most yeast strains have an "Ideal" temperature. I'd think that with most ale yeasts, you'd be OK at 66F though.
As far as time, I've always heard the 1, 2, 3 rule, and it's worked for me. 1 week primary, 2 weeks secondary, and 3 weeks bottle conditioning. Good luck, and let us know if we can help more. (I've also always heard ferment/condition temperatures should be the same, and remain fairly stable.)