You'd have to figure out the refinery and then google the operator/owner to see if they've press released it or disclosed it.
Generally if its a large part of their operations or makes up a decent chunk, they will announce it welllllll ahead of time so analysts are aware and build it into quarterly expectations. Large players (supermajors, large intergrated guys like Suncor), you might not see it pre-announced, but depends on the timing and results to date.
Length of time will vary. Turnaround or scheduled maintenance might run you anywhere from 10 days to 2 months, depends on whats being done.
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