"While going to work here ,I literally walk about 7 mins day" and
"While going to work here ,I literally walk about 7 mins day" and "While I go to work here ,I literally walk about 7 mins day"
What is difference between these two sentense?

Question

"While going to work here ,I literally walk about 7 mins day" and 
"While going to work here ,I literally walk about 7 mins day" and "While I go to work here ,I literally walk about 7 mins day"
What is difference between these two sentense?

Answer

A number of things are wrong with both sentences.

In English, we would say one of the following:

"My daily walk to work takes me about 7 minutes."
"I spend about 7 minutes, each day, walking to work."
"I come here (to work) on foot. It takes me about 7 minutes."
"I walk to work. It takes me about 7 minutes."
"It takes me about just about 7 minutes to walk to work."

GOING and HERE do not belong together in a phrase. In English, we GO THERE and we COME HERE.
LITERALLY is greatly over-used these days. Avoid using it, unless it is necessary.