Conversation so far:
When was Pablo Neruda exiled?
In 1948, becoming threatened with arrest, Pablo Neruda went into hiding and he and his wife were smuggled from house to house hidden by supporters for the next thirteen months.
Where did Pablo Neruda hide while exiled?
Pablo Neruda moved to Valdivia. From Valdivia he moved to Fundo Huishue. Neruda's life underground ended in 1949 when he fled over Lilpela Pass in the Andes Mountains to Argentina.

Question: How long were they hiding?
Self-contained rewrite: How long were Pablo Neruda and his wife hiding?