Time between meetings and use of 久しぶり

Question

Generally speaking, how much time needs to go by before it would be natural to use 久しぶり?
Is 2 weeks too short? A month? Where is the line?

Does frequency affect the usage of 久しぶり? As in, you meet regularly every 2 months, so you wouldn't say 久しぶり?

Example situations:

1) You regularly go to a gym and get to know several people there, but because you sometimes skip days as do they, after seeing them 3 times a week for a few months, a month goes by without seeing them. The next time you meet, would you say 久しぶり?

2) You only rarely go to the library, say once every 3 or 4 months, and someone you know works there. That is the only place you see them. Do you say 久しぶり every time?

Answer 1

I generally use 久しぶり if its more than a month. 久しぶり means "Long time no see" or "It has been a while." How do you define "long time" or "a while" is definitely matter of one's preference.

I believe another variable that you could factor in is how often you are suppose to meet this person. For example, if you see the same person regularly, let's say every 2 weeks. You don't say 久しぶり everytime. However if you were expected to see this person every week but this person misses the meeting or class and there is 2 weeks of gap then you could say 久しぶり after 2 weeks. Therefore I believe you can't always put defined time frame to the word 久しぶり. It deals with how often you are expected to meet this person and the time gap.