Yes. Every last one of them is slaughtered by Odysseus, Telemachus, and their faithful staff.
Not at all. The suitors were guests of Penelope, not hosts.
0. All of them and the priest Leoides die before Odysseus' hands.
In "The Odyssey," the suitors die as punishment for their disrespectful and abusive behavior towards Penelope, Telemachus, and Odysseus' household. Their deaths also serve to restore order and justice to Odysseus' home and signify the re-establishment of Odysseus' authority as the rightful king.
In "The Odyssey," there are 108 suitors competing for Penelope's hand in marriage.
That Odysseus would return after a great deal of time, and kill all the suitors by suprise.
All of the suitors and even the sacrificing priest Leiodes fails at this challenge.
Antinous
Leodes
The two main head suitors in the Odyssey are Antinous and Eurymachus. They are the most aggressive and prominent among the suitors competing for Penelope's hand in marriage.
None of the suitors' lives are spared; Odysseus and his party kill them all. Odysseus does spare Phemius the minstrel, and Medon the herald.
Eruymachus doesn't stop Odysseus, he helps him kill the suitors. All the suitors die in the end.
Odysseus asks the servants to move all the suitors' weapons to another room as part of his plan to confront the suitors without them having access to weapons.