Is it safe to trickle charge my IPhone for 2 hours?

I have downloaded an app called Battery Doctor from AppCake. It is a verified app in the app store.So, I went over to the settings menu and I realize that this was the only app I knew had the trickle charge settings which allows you to adjust the amount of time you want to trickle charge.So, the maximum is 120 minutes. I love having a longer battery life and I don't mind charging longer. Is it safe to trickle charge my IPhone for 120 minutes?

As long as its been approved by apple then it should be already tested and known to be safe within the recommended limits.

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