refactor(model): simplify auto_archive_duration de/serialize (#2379) #131

Job	Run time
Format	14s
Minimum supported Rust version	1m 12s
Spelling	12s
Feature combinations	19m 24s
Minimal crate versions	1m 16s
Build docs	1m 14s
Clippy	1m 39s
Test	2m 16s
	27m 27s

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