Ships of this size were extremely expensive to operate. As a result, the few first rates (the Royal Navy had only five completed in 1794) were typically reserved as commanding admirals' flagships. First rates were typically kept out of commission ("in Ordinary") during peacetime and only activated ("commissioned") during times of conflict. This had the added advantage of preserving them from the wear and tear that smaller ships experienced in spending long periods at sea. Spending time in Ordinary could considerably extend a first rate's lifespan; for instance, by the time she fought in the Battle of Trafalgar, had been in service for 40 years, although a portion of this time was spent in Ordinary.