To the best of my recollection in the 1960s UK and most of the other countries in Europe were at 3 minute increments for billed installations. Payphones for national long-distance STD (no, not what you're thinking!) calls were about 4 pennies for one minute, which as
@ikanbilisclub's recollection is long enough to give "please come and get us" and a location. That would be after a week completely out of communication with our parents while we were roaming around the Welsh mountains with no plan as to where we might go. Except that there should be a pub within a 20 minute walk at each place we camped. Boy Scouts don't have it so free of restriction now
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