Convertible top Motor

Was having a problem with my ram cylinders going up and down but replaced one and the hoses so they seem to go up and down fine now. Question is : How long should it take for these cylinder rams to go up and down when connected to the top and How much fluid should be inside the reservoir so that I don't get a blown out o'ring seal. From what I understand about pressure you don't wanna fill these things to the top.
 
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