frozen pipes

My underground water pipes ,about 5 ft under, froze solid this year while I was away for a couple months. Its been happening this year around the northern places. We have just started warming up now and I notice some condensation coming out of the pipe inside which is open,1 inch copper.Now that we are in the 35-45 degree days and 25 degree nights ..how long do you think before the water starts trickling out which will quickly melt the freeze plug...the plug might be 20 ft long maybe...????How many days.??
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Offgrid in cloudy PNW
MacGyver'ed museum collection of panels, castoff batteries and generators - ready for state of art system install ....
Project I was on in Kazakhstan involved pumping concrete in minus 40 C weather for grouting a dam foundation - no problem, hook up welder to pumper pipe to keep concrete from freezing!
Offgrid in cloudy PNW
MacGyver'ed museum collection of panels, castoff batteries and generators - ready for state of art system install ....