怎么查我的微信用了多少天？

自己回忆吧

110 打这个电话问一下

https://developers.weixin.qq.com/community/develop/doc/0004843f3784384e903a2856d56400?highLine=%25E5%25BE%25AE%25E4%25BF%25A1%25E6%25B3%25A8%25E5%2586%258C%25E6%2597%25B6%25E9%2597%25B4