Weed can most definitely be overcured! Curing works by "sweating" the buds. Overcuring means overdrying. However, curing occurs whena jar is about half full. Filling a jar up to the brim will slow the process down considerably. If you were storing this lb in full jars, you'd have PLENTY of time (1-3 years).
Yes & no depending on how you cure your buds. Main problem is not opening the jars, which could create mold since you are not letting your buds get fresh air.
If you do this, a good cure will take a few weeks, and you will have nice sweet & non-harsh smoking herb