推荐回答（3个）
一年半左右。
金蝉主要是在林下养殖，各种果树、木材树下都可以满足其生长需要，无需投资建场地、场房，无需购买其他养殖设施，我国林木资源丰富，一般三年以上的果树及其他树木下面都难以套种农作物，而金蝉养殖正是利用树下空间，靠吸吮树根的汁液生长，在不影响树木生的情况下发展养殖，可以说一举两得，整个养殖过程无需喂食管理、防疫等，不占用劳动力。
蝉的一生，要经过卵、幼虫和成虫三个不同的时期。卵产在树上，幼虫生活在地下，成虫又重新回到树上。蝉在交配之后，雄蝉就完成了自己的使命，很快便死去。雌蝉则开始进行产卵的任务，它用尖尖的产卵器，在树枝上刺出小孔，刺一次产四到八粒，一个枝条上，往往要刺出几十个孔，然后雌蝉不吃不喝，也很快便死去了。卵在树枝里越冬，到第二年夏天，借助阳光的温度，才孵化出幼虫来。
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