Reasonable is case by case and depends on how late and/or material the matters being provided are including whether I can adequately prepare for the hearing since I was not provided with them sooner.
For example, if counsel provides me with a copy of a check I already knew about then that's no big deal even if I receive it the day of the hearing. On the other hand, if on the eve of trial I am being provided with a stack of documents I did not know anything about or they are springing a surprise material witness on me that is a totally different story.
On matters such as these you have to trust your attorney's judgment as to how is best to proceed; presumably that is why they were hired in the first place.

