can anyone tell me when starts the wallet pos?
Is started but is not working as it should.

it can not stake if your wallet is password protected, you need to unlock it for staking. notice that you need some volume of ESP to stake in short period.
How much ESP volume needed to be able to stake in a wallet? I have more than 25 million ESP sitting in my wallet for more than a month, but seems it doesn't stake at all.
25Million should definitely be staking in a month.Make sure your wallet is unlocked for staking, if its encrypted.