Whatever you like playing best.
In real-life chess, most big tournaments are 90 minutes per side with a 30-second increment and an added 30 minutes after move 40. But online, it is hard to find games this long.
help me in deciding the best time format
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thank you
Online just play 15+10 or 30 minutes Rapid 
15|10 for improvement 3|0 to get the meth experience
what is the best time format