Learn French: Tu n'es pas assez tolérant pour travailler ici. - You are not tolerant enough to work here.

You can turn this into a present condition with a past result: 'If you were tolerant enough, you would have worked here.' To do this, use si + imperfect tense, then the past conditional: Si tu étais assez tolérant, tu aurais travaillé ici.

Why do we use pour right before travailler?

In French, to say you are '[adjective] enough to [verb]', you must use the pattern assez + [adjective] + pour + [infinitive]. Here, assez tolérant pour travailler perfectly maps to 'tolerant enough to work'.

If I am saying this to a female colleague, does the spelling or pronunciation change?

Yes, the adjective tolérant must agree with the subject tu. If you are addressing a woman, it becomes tolérante. This changes the pronunciation because you will now clearly pronounce the final 't' sound.

How would a French person actually say this in casual, rapid speech?

In casual spoken French, the ne of the negation is almost always dropped. Furthermore, the subject and verb tu es are often squished together into t'es. You would very likely hear: T'es pas assez tolérant pour travailler ici.