adverb
Interrogative adverb asking about quantity or degree. Usually written in kana.
この箱にはりんごがいくほど入っていますか。
How many apples are in this box?
駅までいくほどかかりますか。
How much does it cost to get to the station?
Compound of 幾 (iku, 'how many') and 程 (hodo, 'degree, extent'). The exact historical derivation is uncertain, but it follows a common pattern for interrogative adverbs.