For reference, I brought a 1971 911T back to life after sitting for 8 years. Was a 2 owner car with the 2nd owner having some 30 years of ownership before I bought it from him. I spent months working to bring it back to life. Removed and cleaned the fuel tank, replaced all fuel lines, rebuilt carbs, usual tune-up items, charging system woes, battery(ies), ignition system tuning, valve lash, oil system refresh, fixing leaks, tending to cables and linkages needing lubrication, restoring cosmetics along the way, rebuilding pedal cluster, fixing clock and gauges, restoring map pockets, replacing suspension bushings and restoring brake system. All this adds up. Factor in some additional upgrades (I installed S brake calipers, new dampers, new springs, sway bars, etc.) and the bills add up fast even doing it all yourself. I started tracking it all but that became a difficult task as life got in the way and I started enjoying driving it instead!