Apply duration_suboptimal_units lint findings (#7144)

Quote from lint description:
"Using a smaller unit for a duration that is evenly divisible by a larger unit reduces readability. Readers have to mentally convert values, which can be error-prone and makes the code less clear."

Cargo.toml

@@ -301,6 +301,7 @@ branches_sharing_code = "deny"
 case_sensitive_file_extension_comparisons = "deny"
 cast_lossless = "deny"
 clone_on_ref_ptr = "deny"
+duration_suboptimal_units = "deny"
 equatable_if_let = "deny"
 excessive_precision = "deny"
 filter_map_next = "deny"