This is a case of elision. Commonly, an unstressed vowel between two syllables is elided and the word is resyllabized. For example, every [e.ve.ri] with three syllables becomes evry [ev.ri] with two syllables). A few examples from the online Collins Dictionary web site. every (pronounced as evry [IPA evri]) family (pronounced as family or famly [IPA ˈfæmɪlɪ or ˈfæmlɪ]) laboratory (pronounced as labratory [IPA læbrətɔːri (US)]) medicine (pronounced as medcin [IPA medsən])

Some people do say every as ever-ee but it’s most commonly pronounced as ev-ree ☺️ hope this helps

Phonetic respelling is usually done casually. It's invented as it is written. It isn't consistent or scientific. The consistent, scientific way is to use the international phonetic alphabet. I need to learn it! If I turn "ev-ree" back into sound, I get two syllables. If I turn "ever-ee" back into sound, I get three syllables. The normal pronunciation is the two-syllable form. The second "e" is silent. Rarely, you will hear someone say it is "ever-ree," but this is very unusual, it's not in the dictionaries I've checked, and it is done for purposes of emphasis. If someone says "Do it every day, and I mean EVERY SINGLE DAY," the first "every" might be pronounced "ev'ry" and the second as "EV-uh-REE."

No two people talk alike. There is no “ correct” or “standard” amount of elision to use. Imitate people who speak in a manner that you enjoy hearing.

"every", like "very" is a two-syllabic word, first syllable stressed.