Log file size in iPhone

I want to put all my app logs in a file in the Documents directory and then once user tap on "Upload logs" in the application, logs will be uploaded to server. I am planning to keep logs for two days. Is there any limit on the size which I can use for the logs?

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Also, at all point in time I want to keep last 2 days logs and deleting the old ones. How can that be achieved?

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Since you are storing them in the Documents directory, you are not bounded to a specific file size. As for only keeping the last two day's log files, you could just write a pruning function to delete any old ones and call it on app launch & resume from background.