The Fare rules indicate a max stay of 12 months. The second link has a multi-city built in so you can test out different dates.
This fare books into A class which gives a minimum of 100% miles in programs such as Aegean (22361 miles) but it also depends on what fare bucket it maps on United so earnings are most likely higher than that base number. The fare would earn 150% with Miles&More, Lifemiles and Miles&Smiles. (33542 miles)
For United flyers come 2020, this fare earns a decent amount of PQPs (Spend) as Avianca is a partner airline so (22361/5) or 4472 is the bare minimum PQP earned.
|MINIMUM STAY|| TRAVEL FROM LAST INTERNATIONAL SECTOR MUST COMMENCE NO|
EARLIER THAN 3 DAYS AFTER DEPARTURE OF THE FIRST
OR - TRAVEL FROM LAST INTERNATIONAL SECTOR MUST
COMMENCE NO EARLIER THAN THE FIRST SUN AFTER
DEPARTURE OF THE FIRST INTERNATIONAL SECTOR.
|MAXIMUM STAY|| TRAVEL FROM LAST SECTOR MUST COMMENCE NO LATER THAN|
MIDNIGHT 365 DAYS AFTER DEPARTURE FROM FARE ORIGIN.
|STOPOVERS|| UNLIMITED FREE STOPOVERS PERMITTED ON THE PRICING|
NO STOPOVER OCCURS IF PASSENGER TAKES NEXT
AVAILABLE FLIGHT WITHIN 24 HOURS.
|TRANSFERS|| UNLIMITED TRANSFERS PERMITTED. - SURFACE AT FARE BREAK|
AND EMBEDDED SECTORS PERMITTED EXCEPT FOR PRICING UNITS
WITHIN/BETWEEN US AND CANADA - INCLUDING PR/USV1 -
SURFACE AT FARE BREAK IS NOT PERMITTED.
United Business Class
Avianca Airbus 330 Business Class
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