DonkeyMails Help - How do I receive cash by reading mails.

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Sorry I know I have made a post on this before but this is a different topic and will be my last. Okay so I just received 6 new mails and I clicked on them and then went off them again, when will they be credited and how much is it per email read? I cant find the "FAQs" page soI decided to post it here - please help me by giving me some advice or if you know - please tell me. I just need to know - Do I have to stay on the email for a certain amount of time or can I click it and then just get off it again and when does it get credited?