Rule reminder
Summary of all Italian cleft structures: (1) Standard: È + [focus] + che + indicative clause. (2) Number agreement: essere agrees with the focused element. (3) Alternative: È stato + [subject] + a + infinitive. (4) Pseudo-cleft: Quello/Ciò che + verb + è + [focus]. (5) Negative: Non è + [focus] + che + clause. (6) Literary past: Fu/Furono + focus + che/a + infinitive. (7) Spoken colloquial features (da + time + che, emotional emphasis). (8) Subjunctive after superlatives and restrictive expressions.
You want to express emphatically that you have been waiting for two hours. Which is most natural in spoken Italian?