My well is 380' deep & I'd need to get the water up an additional 125' (for pressure) for a total lift of 505'. The pump wouldn't have to be powerful as long as it could reliably produce 260 gallons in about 12 hours every 4 days (I'd need 455 gallons per week).

-how long would a sufficiently sized submersible pump have to run to pump 260 gallons 505'.......
....or in other words, how much electricity am I going to use to get the job done?