Is it known how many ‘conversations’ ChatGPT can hold?

So, I start asking some questions about a certain topic or helping me fill out some kind of form. I go away, I come back after the weekend and so on

Is there a limit to how many of these 'conversations' are held?

From googling, it seems there may be a limit on long conversations but not much info about what constitutes 'long'

Long from ALL conversations or long from a particular one you're having or long in that the more new conversations then the older ones 'drop off'?

Any knowledge would be welcomed

Thanks

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