Welcome back bundle(s) availability question

I recently came back to the game and am thinking about buying the welcome back bundles.
In order to plan my budget, i would like to know how long it is available.
Will it just stay in store until i bought it? Or does it have any triggers that remove it from the store?
For example:
Do i only have X days since my first login (after coming back) until it vanishes?
Do i only have until i reach rank X until it vanishes?
etc.

Edit:
So, after 14 days (came back to HS on April 11) and this monday (April 26) the welcome back bundles were no longer available. I am not sure if there are others triggers for them to disappear, but 14 days seems to be the time limit.
If any blizzard person reads this, it would be super cool if this information would be publicly available. Since the bundles are not in the “limited time” section but the regular section of the store, it is not clear at all that they will vanish. So you lose out on possible income.

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