In a cold water bath, plan for about 30 minutes for every pound. (So an 8-pound chicken would take at least 4 hours to thaw.) After thawing in a cold water bath, the chicken should be cooked immediately.
Yah, It is hard to be a roto chicken. Having them in the freezer is nice and convenient, but I like to pick them up a day or two before I want to spin them and just keep them in the fridge until it is time.
I used to have a vacuum sealer but I give it away because of the cost of the bags. But now I'm sure I've thrown away more money and what could have been good food if I vacuum sealed it.
If you are throwing away frozen meat then you can't afford not to have a vac sealer. Last night I had a beauty of a steak that I froze in February 2018 because I don't always pull FIFO. I've even used meat that has been frozen 2 years. Who can complain about this cost? https://www.amazon.com/exec/obidos/ASIN/B00I1OM7TO/tvwb-20
And if you have a 16" sealer you can purchase 15" bags at a similar price point.