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```

    映画が好きなので、時間とお金が（　　）かぎり見に行っている。
    
```

I haven't been able to find a satisfactory answer as to why 許す in plain
dictionary form works better here than 許せる, the potential form.

```

    動詞につく場合は、ている形や可能動詞などにつくことが多い。
    
```

seems to imply that ～限り can take the potential form just fine. Can someone
explain why the plain form should be used in this sentence, and whether or not
this is a representative example or a unique case?

Edit: Another sentence from the same source (Shin Kanzen Master N2) uses the
potential form here:

```

    考えられる限りのことは考えてみたんですが、いい案が出てきませんでした。
    
```

So clearly the potential form can be used with this construct, at least
sometimes.
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question
grammar potential-form
Potential form and ～限り
To me, 時間が許す is just a set phrase. 時間が許せる is grammatically correct for sure,
but it sounds wordy and strange in most situations.

Traditionally, [a sentence like this was rare and
unnatural](https://japanese.stackexchange.com/a/32449/5010) in Japanese.
Usually time does not allow or reject something as if it had its own will.
時間が許す is okay because it's an established set phrase, though. Maybe it was
something directly imported from English "time allows"?
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answer