Maximum life expectancy

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Senior Member
Czech Republic, Czech
Hello everybody,
I always assumed that life expectancy refer to how long people are expected to live and also what the shelf life of a product is. But now I am reading instructions how to install stone panels on the wall and it says:

1. Cover the fixing areas with adhesive using a toothed trowel. Once the adhesive has been applied, it maximum life expectancy is 40 minutes.
2. Fix in place using a rubber mallet....

Does it mean that I have to wait 40 minutes before I fix it in place or that I only have 40 minutes to fix it as it will then harden?
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