Learn Turkish: Şenlik alanında saatlerce senin kadar sabırlı bekledim. - I waited for hours at the festivity area as patiently as you.

This highlights the current lesson's focus on extensive quantity. The word is built from saat (hour) + the plural -ler + the adverbial suffix -ce. When attached to a plural time or quantity noun, the -cE or -çA suffix emphasizes an extensive, drawn-out amount of it. Thus, saatlerce translates to "for hours" or "for hours on end."

Why does kadar take the genitive form senin instead of just the base pronoun sen?

The postposition kadar (meaning "as much as" or "as...as") has a specific quirk with personal pronouns. While regular nouns stay in their base, uninflected form before it (e.g., çocuk kadar - "as much as a child"), personal pronouns like ben, sen, o, and biz must take the genitive case. That is why it becomes senin kadar (as much as you) rather than sen kadar.

The English translation says "patiently," but sabırlı is the adjective "patient." How does it act as an adverb here?

In Turkish, it is very common for adjectives to function directly as adverbs to modify a verb, without needing a special "adverbial" suffix like "-ly" in English. Because it sits right before the verb bekledim, sabırlı describes how the action was performed. Note that you could also say sabırla (with patience) in this sentence, which would carry the exact same meaning.