how long does the task site take to send its payment?

Could definately be that they are now scamming you. Sites are getting a little 'smarter' where they will have a low min. payout, pay you once, and then up the min. or delay payments for different reasons despite the time you spent there and your deserved money. I would leave this site if they are delaying payment.

Did you mean the task at mylot. It depends on the creator of the task. When he check it and if he find that your job is correct then he pays. But if you mean to other micro job sites it depends on both sites and job creators. Basically sites are scam. If you work in Microworkers, minute worker like sites those pays depends on creator. Are you thinking that you did well in you task but you have not paid, Just report about the creator.

If you are talking about the tasks on myLot then it will depend on who created the task. When I have my tasks available I usually check the completed tasks and pay the users who have completed them as soon as I get back online. I am not here when I am sleeping though and I guess others aren't either

Which task site are you referring to? Is it the tasks that you do here on MyLot or another site? You can say the name of the site so that you can feedback from othere people here that may also be on the site. You will get better feedback and more useful and helpful responses.