Both levels at a single sitting?

[I_m_legend]

Hi, is it that much difficult to sit for both levels of FRM at a signle sitting? I’m currently into the prep for Level 2 of CFA Program. So, can’t make it in this November or Next May. But I want to sit for both levels in next year November.
What do you guys say? Is it a good strategy? Besides, how many hours do I have to deicate for eah level?
p.s. I have a plan to finish CFA, FRM and CAIA by April, 2015. So, I should finish FRM in a single sitting.