I don't no about this pyramining and mining but still want to invest some what is minimum limit and what is minimum time for payout can you explain because i am just newbie in this field and want to in this field as investor and want to do some practically in future REGARDS
If you read the FAQ you should find all the answers, anyway:
1) There is no minimum limit on deposits. However depositing less than 0.1 makes little sense. However everyone is free to deposit whatever they feel like.
2) The time for payout depends on several factors: a payout is generated every 0.1 BTC mined by your account. If you invest a big sum, you will receive payouts daily. If you invest less than 0.1 it will take a few months.
3) Currently the account will not be activated in realtime, I am installing a lot of infrastructure (you can see how long is the queue currently). However by the end of August the queue it should be empty. If you deposit now, chances are that your account will become active in ~ 3 weeks.
4) Complete payout time depends on many factors, the most important one is the bitcoin mining difficulty. However investing in pyramining should be less risky than buying your own devices because: a) in general it is cheaper (I say in general because in this period of ASIC transition, with all the producers that change prices daily, sometimes there may be better offers elsewhere) - b) as technology improoves, your borrowed hashing rate increases; at a little expense of smaller efficiency at the beginning, chances that you will profit investing in pyramining are higher than investing in your own equipment.
Keep in mind that despite all my efforts to keep things profitable and trying to manage everything at best, there are no warranties, so do not invest what you can't afford to lose.
There are third parties (like The Rock Trading) who offer a warranty on the deposits, links-pyramining and others who planned some initiatives, just read here in the thread or use google to find out.