अब्दे द्व्यर्धे नदीजानां पञ्चाब्दे पर्वतौकसाम् ॥ कZ_०२.३२.२२च्द् ॥
abde dvyardhe nadījānāṃ pañcābde parvataukasām
For river-bred (stock), the period is one-and-a-half years; for mountain-dwelling (stock), it is five years.
Lifecycle-based planning: categorize assets by durability and schedule replacement/rotation accordingly to minimize failure in service.
To align deployment and maintenance budgets with expected endurance, preventing overuse of short-lived stock and leveraging hardier stock for longer cycles.