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First of all, most oven thermometers move very slowly compared to the electronic sensors and controls on the oven. To make sure you are getting an accurate reading, the thermometer should be in the center of the oven, the oven should be preheated, then wait another 20 minutes after the preheat beep. If the temperature is less than 35 degrees higher or lower at this point, it can be adjusted via the controls. Usually on GE ovens you press and hold bake and broil at the same time until SF comes up in the display. Then press bake, then use the arrow keys to raise or lower the temperature setting. If the temperature is more than 35 degrees off, you may have a bad sensor, bad control board, or other problem.
Most thermostats have a differential field on them of 5 degrees, that is non adjustable. The reason for this is so the furnace does not burn
itself out by cycling on and off trying to keep the the temperature you desire. If you have the old fashion round honeywell mercury type thermostat, you may want to adjust the preheat element on it. Take off the cover and there is a plate near the bulb with decimal numbers on it that have to match the ampere rating of the oil burner or gas burner, so make sure this is done.
More than likely, its your oven thermometer thats taking a half hour to read correctly. The oven is probably getting there sooner. If you had a digital thermometer, the read would come quicker. So save your money,nothing wrong with your stove.
I would suggest looking at how long before the bake burner ignites. If taking longer than 5 minutes before it ignites, then you are looking at a possible bad ignitor. The ignitors just don't last more than 5 yrs with regular use.
If your oven has the hidden bake element then it is probably working properly. A standard oven with an exposed bake element will usually take about 12-15 minutes to preheat. The hidden element models take a little longer but they usually heat a little more evenly.
Post back if you have any more questions.
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