If I have correctly understood your question, then the short answer is yes.

They were but a day away, if she understood correctly.

If I understand correctly - this is a whole category of questions we get.

"If I understand correctly, this was found inside someone's house."

We are using, if I understand correctly, the primary satellite for our talk.

If I understand correctly, this is about the vote on the 2012 calendar.

Our differences lie in how and from when, if I have understood correctly.

So I have correctly understood - they are not accepted.

Some question as to whether he was working for the house or against it, if I understand correctly.

If I understand correctly, the average shelf life of vegetables in the market is two months.