Wjen should I ask her out?

so my friend is doing this online dating thing and its going well. and the question just popped into my head. how long should you wait before asking a woman you met online to meet face to face? is there a time limit or just until she feels comfortable? and if its when she feels comfortable then how can you tell? are there signs or do you just joke about it and see what her reaction is?

or the more logical answer... im over thinking it.
Wjen should I ask her out?
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