Looking on the internet deeply has found these results:

In the past few days is the most popular phrase on the web.

On the past few days 138,000,000 results on the web	In the past few days 138,900,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	In the past few days a security fence has been built and we welcome that. In the past few days, the President of Romania has unfortunately stated once again that he does not support Székely territorial autonomy. A lot of us don't agree with the choices Chef has made in the past few days. In the past few days since my in In the past few days the gold price sank repeatedly, although it stabilised again. In the past few days, a shipment arrived in Monza in Italy containing over a hundred monkeys from China, destined for a laboratory which carries out vivisection and scientific experiments. I've had them running around the city in the past few days. laws brought me home, I have endured... more pain than I thought humanly possible.

On the past few days

138,000,000 results on the web

In the past few days

138,900,000 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

In the past few days a security fence has been built and we welcome that.
In the past few days, the President of Romania has unfortunately stated once again that he does not support Székely territorial autonomy.
A lot of us don't agree with the choices Chef has made in the past few days.
In the past few days since my in
In the past few days the gold price sank repeatedly, although it stabilised again.
In the past few days, a shipment arrived in Monza in Italy containing over a hundred monkeys from China, destined for a laboratory which carries out vivisection and scientific experiments.
I've had them running around the city in the past few days.
laws brought me home, I have endured... more pain than I thought humanly possible.