A single domestic connection can't be refilled fast enough to cover 3–4 cylinders/month on its own — the legal gap (25 days urban / 45 rural) caps one connection at roughly 1 cylinder every 25–45 days. That's why you're pooling multiple families: each one contributes on its own cooldown, and the scheduler rotates between them.
2 Monthly Cylinder Requirement
Your need varies month to month — set each one individually. New months appear automatically based on the phase length above.
3 Friends' Family Connections
Legal minimum gap between bookings on one connection: 25 days urban · 45 days rural. Annual cap per connection: 12 subsidized + 3 market-rate = 15 total/year — this is shared between the family's own personal use and what they lend to you, so tell the scheduler their real personal usage.