Short answers, pulled from the story.
Skylab launched on the 14th of May 1973 and was occupied by crews until the 8th of February 1974, a total of about 24 weeks. Three crews visited the station on missions designated Skylab 2, Skylab 3, and Skylab 4.
Skylab was built from a repurposed Saturn V third stage, the S-IVB. The stage's interior was fitted out on the ground as a "dry workshop" and launched directly into orbit, rather than being converted in space as earlier wet-workshop plans had envisioned.
Skylab had a pressurized volume of over 350 cubic meters, a figure that was not matched until the completion of Mir in 1996. Its central Orbital Workshop alone, at 270 cubic meters, was larger than the biggest single module on the International Space Station, the Japanese Kibo module at 150 cubic meters.
During launch the micrometeoroid shield tore away, taking one solar panel and jamming the other, leaving the station critically short of power and unprotected from solar heating. The Skylab 2 crew, launched on the 25th of May 1973, deployed a parasol sunshade designed by Jack Kinzler and freed the jammed panel during spacewalks, saving the station in the first in-orbit repair of that scale.
Skylab 2 lasted 28 days, Skylab 3 lasted 59 days, and Skylab 4 lasted 84 days, for a combined total of 171 days and 13 hours across the three missions. Each mission successively broke the human spaceflight endurance record, which previously stood at 23 days.
Skylab reentered on the 11th of July 1979, with debris landing about 300 miles east of Perth, Western Australia, due to a four-percent calculation error. Pieces were found between Esperance and Rawlinna, roughly 130-150 kilometers around Balladonia. Stan Thornton of Esperance collected 24 pieces and claimed the US$10,000 prize offered by the San Francisco Examiner.