How long until my cat and kitten get along?

Question

I have an shy 8 year old female cat, 3 weeks ago I brought a 4 month old male kitten. the first week the female cat was afraid of the kitten she was always hiding, the second week she lost fear but keep distance, the third week she gets pretty annoyed if the kitten gets near her, and hisses at him

they can be in the same room without problem, but if the kitten gets too close to her then there will hissing and scratching. how long until they get along?

Answer 1

itll take like a month or two, my cats got along in the first month.

Answer 2

Until one eats the other.  

Answer 3

My cat and kitten, both female, don't get along and they've been living together for a year and change, now.

Sometimes they do, sometimes they don't. Until a hierarchy is established, fur's gonna fly for a little while.

Also, is your kitten fixed?