Being a pessimist I usually plan for a worst case scenario of refresh interval *plus* TTL even though my current providers secondaries do pay attention to NOTIFYs.
The NOTIFY RFC goes back several years and has been the predominant mode of zone refresh for as long, in all the major DNS implementations, such that SOA "refresh interval" has been marginalized for years. DNS is much more lively and current than your pessimismistic view.
Len
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