I'd say at least 5 or 6 episodes
Episode 1- Showdown begins. Frieza makes it clear he's out of Son Goku's league
Episode 2- Goku attempts to put Frieza down with the spirit bomb. Frieza survives and wounds Piccolo and kills Krillin. Goku becomes Super Saiyan of legend.
Episode 3- Super Saiyan Son Goku orders Gohan to take Piccolo and find Bulma and get off Namek. He then shows Frieza the tables have turned. Frieza plays into Goku's pride as a warrior to allow him to power up. When Goku still has aan advantage, Frieza blast Namek's core, announcing the whole planet will blow up
Episode 4- On earth Mr.Popo summons Shen Long who revives the Namekians, which brings Grand Elder back, which in turn gets Porunga restored. Kaio communicates to Dende to wish everyone but Goku and Frieza off Namek.
Episode 5- Characters back on earth discuss what is going on, back on Namek Frieza resorts to using his flying razor disk of death which ends up cutting him in half
Episode 6- Conclusion; Goku leaves Namek, Porunga brings dead characters back to life. Everyone's happy yadda yadda