Template:U:hu:compound-numeral-adjectives

Compound adjectives with a numeral and the name of a unit (as in “a one-hour walk” or “a three-storey building”) are written as solid if both constituents are single words, e.g. egyórás séta (“a one-hour walk”), from egy and órás). By contrast, if either element is a compound word (or both of them are), their compound will be written as separate words, e.g. tizenegy órás út (“a trip/flight of eleven hours”)), from tizen+egy + órás or egy hónapos utazás (“a journey of one month”), from egy + hó+napos.^[1] (See also the analogous rule for material designations.) In practice, this rule is sometimes disregarded, especially in casual texts and in case of less common compounds.

The -van/-ven (“-ty”) in round tens are suffixes, so e.g. negyvennapos (“forty‑day”) is written as solid. On the other hand, compounds with a number always written separately, e.g. 6 éves. Also, adjectives (and nouns) for the denomination of coins, banknotes, and revenue stamps are written as solid, e.g. kétezerforintos bankjegy (“a 2000‑forint bill”), despite kétezerforintos having the compound kétezer (“2000”).