Both seem to be possible. But what's their difference?

Instances of the former are everywhere, e.g. a line from
「[華麗なるギャツビー](https://books.google.co.jp/books?id=ES7kAAAAQBAJ&pg=PT124&lpg=PT124&dq=%E2%80%9D%E3%81%84%E3%81%A4%E3%81%BE%E3%81%A7%E5%BE%85%E3%81%A3%E3%81%A6%E3%81%84%E3%82%8B%E3%81%A4%E3%82%82%E3%82%8A%E2%80%9D&source=bl&ots=3g9jYUYP27&sig=oVvLHXZN5ZW_MjUC3ln9UsNbmI8&hl=en&sa=X&ved=0ahUKEwj-
mu2BxoPMAhXm5qYKHTTyD1UQ6AEIGzAA#v=onepage&q=%E2%80%9D%E3%81%84%E3%81%A4%E3%81%BE%E3%81%A7%E5%BE%85%E3%81%A3%E3%81%A6%E3%81%84%E3%82%8B%E3%81%A4%E3%82%82%E3%82%8A%E2%80%9D&f=false)」

> 「信じられるもんですか、あんな男」「いつまで待っているつもりです?」

The latter may be less common (?), but still some instances can be found, e.g.
a line from 「[賭博黙示録カイジ](http://mangadget.net/comic_images/detail/997)」

[![enter image description
here](https://i.stack.imgur.com/tusdv.jpg)](https://i.stack.imgur.com/tusdv.jpg)

[Sidenote]

In my mother tongue, Chinese, it will sound very weird to use aspect particles
indicating progressiveness or continuity (such as 「在」 or 「着」) in such cases.
That is, we will almost always opt for the equivalence of 「いつまで待つつもり」:

> √ 打算等到什么时候？
>
> × 打算等着到什么时候？
>
> × 打算在等到什么时候？

Therefore, it's hard for me to grasp the difference in nuance (if any) between
the two usages in Japanese.
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question
word-choice aspect
「いつまで待つつもり」 v.s. 「いつまで待っているつもり」
「いつまで待つつもり」can be translated to "Until when do you plan to wait?"

「いつまで待っているつもり」can be translated to "Until when do you plan to be waiting?"

In other words, I think it's just a matter of tense (present vs. continuous)

As a side note, both of these phrases are often used sarcastically, with the
underlying tone being "hurry the heck up" and/or "what the heck are you
waiting for?"
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If you are asking this to someone who is already waiting for something _now_ ,
whichever is fine. いつまで待つつもりですか may sound slightly blunter than
いつまで待っているつもりですか, but the difference is very small.

If you are asking this to someone who is going to start waiting for something
_in the future_ , いつまで待つつもりですか will be the natural choice. いつまで待っているつもりですか may
sound odd for the obvious reason.

> 「あした行くラーメン屋、大人気で、すごく並ばないと入れないんだって」「いつまで待つつもり？」「12時になっても入れなかったら諦めよう」
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