Yes, when you set the tick label that then becomes hardwired text independent of the value.
Are the x axis variable(s) in datetime or just double in seconds? If numbers get too many orders of magnitude you may well run out of room to write all the necessary digits.
You can play around with the axis numeric or datetime ruler depending on the data source but owing to the aforementioned length of the data string you might consider scaling the values and using annotation either in the ticklabel format itself or just as part of the axis title--consider
Unlimited variations on a them, of course...