The link I posted above was just my first hit on google. The link below explains the technique I used much better.
Roger, I believe the 150V @ 15amps is overkill, but I get much, much better results with a DC power supply - never paid much attention to the amps, maybe 2 :). If you have one, use it...if not, you can get by with batteries.
I used the same technique for my axe as in the link. It is easy and requires only a couple of bucks. Just watch out for the batteries overheating, they get hot. As for "cook time", you see when it changes. The color your titanium changes will depend on the voltage you apply to it. Take a look at this guys logo
The logo gives the achievable colors versus voltage. I believe it starts at 0V and goes until 110V...I think. S you apply more volts, the color will just repeat themselves. I used 36V which gives a blue-ish finish.
Remember that it is voltage that changes the Ti color, not the amps (although I believe the amps make it change faster and let you do a larger part). A common mistake after I tell people this is to use a 12V car battery...it won't change color. Also, anodizing aluminum is a slightly different procedure which requires a little more stuff.
Hope that helps.