What is the total number of rak'ahs and salutations (Taslims) required for the Tarawih prayer?

Prayer in a Ship and the Tarawih Prayer

• Twelve (12) rak'ahs with six salutations.
• Twenty (20) rak'ahs with ten salutations.
• Eight (8) rak'ahs with four salutations.
• Thirty-six (36) rak'ahs with eighteen salutations.