Translation of "several months" into Japanese

For several months I saved money by collecting and selling palm kernels.

私は数か月間,ヤシの実の仁を集めては売って,お金を蓄えました。

If there's a world-wide all-out nuclear war it's said that there will be a "nuclear winter" all over the planet for several months.

世界的な全面核戦争が起これば、地球規模でこの「核の冬」が数カ月間も続くと言われています。