It depends on the 'cut' of the crystal.
http://www.radio-electronics.com/inf...s-at-sc-ct.php Some cuts are more-stable than others.
As an example, I recently dragged out of retirement a Pye W15FMB Westminster two-way VHF radio that I'd used for 145MHz mobile in the 1980s. This uses xtals on 4.mumble MHz whose output is successively multiplied-up to 145MHz. To my amazement after 20 years in hibernation in the attic, all the channels were still within 1KHz.