Many of them are semipermanent and have been burning for years, some even for decades.
From the newscientist.com
Such corrals could become semipermanent fixtures throughout the city if all goes well.
From the sacbee.com
The semipermanent Russian flotilla is nothing if not well-organized.
From the time.com
That traveling city became semipermanent outside President Bush's ranch in Crawford, Texas.
From the boston.com
The tents were gone, replaced with semipermanent structures, coffee shops and fast food huts.
From the atwar.blogs.nytimes.com
This allows them to build semipermanent or permanent villages.
From the en.wikipedia.org
By the end of 2010, UNICEF had completed 57 semipermanent schools, with another 70 under construction.
From the cnn.com
Electrets have a semipermanent external electric field, and are the electrostatic equivalent to magnets.
From the en.wikipedia.org
Entertainer Josephine Baker had a semipermanent suite.
From the time.com
More examples
Long-run: relating to or extending over a relatively long time; "the long-run significance of the elections"; "the long-term reconstruction of countries damaged by the war"; "a long-term investment"
Neither temporary nor entirely permanent; of indefinite duration