How many times should a guy initiate the conversation to know if a girl likes him?

tj_tj1
so I met this girl who's a friend of one of my friends, we were 5 guys and she was the only girl but at the end she only asked for my number and then we exchanged numbers. Cuz am a guy I initiated the first conversation but she suggested that we go to the gym together someday. So should I wait for her to initiate the 2nd conversation or should I start the conversation again
How many times should a guy initiate the conversation to know if a girl likes him?
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