The cycle consists of 12 concerti which are notoriously fitted on 2 LPs, 3 concerti per side. Typically side 1 and 2 are about 30 minutes long, prone to inner groove distortion.
The only recording of La Stravaganza issued on 3 LPs is that of Pro Musica String Orchestra Stuttgart directed by Rolf Reinhardt (Discogs). The sound clips available on Youtube do not sound very promissing as for sound quality, although this may be due to poor grabbing (sound clip, different rip). The recording is from 1954 and the playing is quite different from today's ideal of "historically authentic" interpretation.
The recording which I have (Academy Of St.Martin-In-The-Fields with Neville Marriner for Argo/Decca) sounds O.K. with just very slight loss of quality at the end of 30 minutes long side 1, even on my German reissue
.