Your guest passes are valid until the expiry date marked on them.
Other questions that may interest you
I bought a package including the Biodôme, before it closed. I didn’t use the Biodôme portion. Can I keep my ticket and use it once the Biodôme reopens or exchange it?
I bought some tickets online (single or package tickets), and I didn’t make it to the Biodôme before it closed. What can I do with them?