One month visit visa renewal


please some one tell me how many time we can extend a one month visit visa .. I am already done two time for my son (9 month) .. that means he about to finish his 3 months by July 26th .. can I extend 3 more times ? Means 6 months total ?

Someone here told me it's possible only three months . If it's one month visit visa ? Is it true ?

Please tell me , if anyone tried this .. or any other link .. thanks

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