I'm presently trying to increase the distance i can use a rc device. So I want to know how I can do it?
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Voltage in a series circuit add.
To get 24 volts from a stack of 1.2V batteries, you will need 20 batteries. At least.
You cannot estimate the run time of your batteries and motor.
You have the capacity of the batteries, but not the current drawn by the motor. You would need both to make an estimate.
If you knew the average current that your motor draws then you could compute the estimate by dividing the capacity by the current.
Say your motor draws an average current of 1A. You would divide .7Ah by 1A and arrive at .7h. So, about 40 minutes.
That is very much an estimate, though, because things are never simple. In real life, you probably wouldn't get anywhere close to the estimated run time.
You have resistance from the connectios between the batteries to consider.
You have losses in the batteries to consider.
That "average" current doesn't account for the motor drawing like 10 times the average when it starts up with a load on it.
It would surprise me greatly if you got any kind of usable operation with a stack of batteries that big.
I expect a 24V motor to draw more current than your batteries can reasonably supply.
You would be better off with a couple of 12V batteries.
Or, maybe I am wrong. Maybe your motor only needs 100mA, and will work OK with your battery stack.
No way to tell, though. You don't yet know enough to know what information is relevant to your question.