I usually have an hour for lunch break. ->Good sentence

It usually start at 11:30 and ends at 12:30.

->It usually starts at 11:30 am and ends at 12:30pm

I usually eat with my coworkers in my department.

I usually go down to company cafeteria.

->I usually go to our company cafeteria

There are many kinds of food in cafeteria such as korean, chinese, japanese, intalian, and so on.

-> There are many kinds of food in the cafeteria such as korean, chinese, japanese, intalian, and so on.

Among them, the most popular food in cafeteria is korean food.

->Among them, the most popular food in the cafeteria is korean food

They serve many kinds of menus such as 바베큐, kimchi stew, kimchi fried rice, and stir fri noodles with vegetable. ->Good sentence

After enjoying lunch, We usually go walking outside of company, and We usually talk about our work lives and any new gossip that is going around in the company.

->After enjoying lunch, we usually go walking outside the company and we talk about our work lives and any new gossip that is going on around the company.

Sometimes, we talk about our girlfriends or our family, some single guys would tell us about their blind dates.Because we are just coworkers

->Sometimes, we talk about our girlfriends or our family. Some single guys would tell us about their blind dates, because we are  coworkers.

Hi!

Thank you for explaining this again. Me too, I have 1 hour break time. It starts at 9:30 am until 10:30 am. Have  a nice day!

Teacher Mae