* Figures are averages assuming the owner does all labour. Costs are for consumables, parts and supplies only. Times are in hours per month.
| Maintenance Item | Seastead (hrs / $) |
55 ft Sailing Catamaran (hrs / $) |
55 ft Power Trawler (hrs / $) |
60 ft Monohull (hrs / $) |
55 ft Silent Yacht (Solar Cat) (hrs / $) |
|---|---|---|---|---|---|
| Underwater hull / foil cleaning & anti‑fouling | 1.0 hr / $20 | 2.0 hr / $30 | 1.5 hr / $25 | 1.5 hr / $25 | 1.5 hr / $20 |
| Propulsion system service (engine, electric motor, foils, RIM thrusters) | 4.0 hr / $70 | 1.0 hr / $30 | 2.0 hr / $45 | 1.5 hr / $35 | 0.5 hr / $10 |
| Propeller / saildrive / thruster inspection & cleaning | 3.0 hr / $20 | 1.0 hr / $10 | 0.5 hr / $5 | 0.5 hr / $5 | 0.5 hr / $5 |
| Electrical & solar panel cleaning & checks | 2.5 hr / $25 | 0.5 hr / $5 | 0.25 hr / $2 | 0.25 hr / $2 | 2.0 hr / $15 |
| Window & glass cleaning | 2.0 hr / $10 | 1.0 hr / $5 | 1.0 hr / $5 | 1.0 hr / $5 | 1.5 hr / $7 |
| Deck & exterior cleaning | 2.0 hr / $15 | 1.5 hr / $10 | 1.5 hr / $12 | 1.5 hr / $10 | 1.0 hr / $8 |
| Stabilizer (mini‑airplane) inspection & servo | 2.0 hr / $15 | — | — | — | — |
| Structural frame / truss inspection & corrosion protection | 1.5 hr / $10 | 0.5 hr / $5 | 0.5 hr / $5 | 0.5 hr / $5 | 0.5 hr / $5 |
| Dinghy & electric outboard service (RIB) | 1.0 hr / $20 | — | — | — | — |
| Bilge pumps & water‑management checks | 0.5 hr / $5 | 0.5 hr / $5 | 0.5 hr / $5 | 0.5 hr / $5 | 0.5 hr / $5 |
| Safety equipment checks (fire, life‑raft, flares, etc.) | 0.5 hr / $10 | 0.5 hr / $10 | 0.5 hr / $10 | 0.5 hr / $10 | 0.5 hr / $10 |
| Battery management & monitoring | 1.0 hr / $20 | 0.5 hr / $10 | 0.5 hr / $10 | 0.5 hr / $10 | 1.0 hr / $20 |
| Regular monitoring & automation software updates | 1.0 hr / $0 | 0.25 hr / $0 | 0.25 hr / $0 | 0.25 hr / $0 | 0.25 hr / $0 |
| Total per Month | 22 hr / $240 | 9.25 hr / $120 | 9.0 hr / $124 | 8.5 hr / $112 | 9.75 hr / $105 |
5 years (≈2030): Expect early‑generation humanoid robots to handle simple, repetitive tasks such as deck scrubbing, window washing, solar‑panel brushing, and visual inspections with a handheld tool. They will still need human supervision for delicate tasks like bearing replacement or electrical wiring.
10 years (≈2035): Advanced humanoid robots should be capable of more complex interventions: changing oil filters, lubricating thruster bearings, swapping out small modules (e.g., a RIM‑thruster impeller), and even performing basic welding or composite repairs. With suitable end‑effectors, they could carry out most of the monthly “to‑do” list while the owner monitors via remote control or VR. Full autonomy will still be limited by legal liability and safety standards, but a large fraction (≈70 % of routine tasks) could be robot‑assisted.
All estimates are indicative and will vary with usage intensity, environmental conditions, and the owner’s skill level.
```