Looking on the internet deeply has found these results:

my best time ever is the most popular phrase on the web. 

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• it's our first time or this is our first time?
• in my first time or on my first time?
• this is my first time or this is the first time?
• This is my first time or It is my first time?
• who always do my best to or who ever do my best to?
• most important your time or most importantly your time?