How long does it take for D. Lobata to hatch?

[Mantless]

I have an ooth that I'm not sure is fertile or not, it was laid on March 31st 2014.

 

[SSimsswiSS]

Longest one I had hatched out a little over 5 months from lay date.

 

[Aryia]

The two of my ooths hatched pretty on-time on the 6 week mark, they were kept at room temperature 75-80 degF. D. Lobata like to take their time with everything, from laying ooths to hatching to molting...