Yes. Tested parts leave Cairo by express courier, and we will be candid about what the realistic arrival window is for this destination rather than quoting an optimistic one.

Not as a continuous quantity. Elsewhere a lead time is a number of days and arriving a day late costs a day. Here resupply arrives on a schedule, so the real question is whether an item makes a particular shipment. Missing it by an hour and missing it by a week produce exactly the same outcome, which is that you wait for the next one.

It makes completeness matter more than speed. The cost of an incomplete order is not a short delay but a full interval, so the time spent making sure a list is right is almost always repaid. Ordering quickly and partially is the expensive option, which is the reverse of the usual instinct.

Yes, and the multiplier is the interval rather than any general principle. If resupply comes at a fixed cadence, holding has to cover at least that cadence plus the time to notice a failure, and anything less means a system is down for the remainder of an interval.

The high-failure, low-cost ones above all: drives, power supplies, fans. Being short of a fifty-dollar part for a full resupply interval is the most avoidable outage there is.