Noob Q on Mining on EthPool.org

Hell everyone,

I been mining on Dwarfpool and things have been going well mined almost .5 Ether in the 6 weeks and my rig is finally stable and running well. I started solo mining at Ethpool.org about 30 hours ago and have some questions. My dashboard shows Hashrates/ Credits/ Next blokc/ Active workers and Shares.

My hash rate is reported correctly at 119 Mh/s (running 3-580s and 1-470 GPUs)
Credits show as 8.50t
Next block in ~5 months

Can someone explain what the credits are and next block in % months?

Does that mean it will take me 5 months to find a block at this hash rate? If that's the case I may as well run on a pool with my low hash rate. lol

My rig is built from hand me down computer parts and such and I'm putting together a proof of concept if I should get another MB with additional GPUs.

Thanks