[Grammar] which we hope that will last a lifetime.

[ambitious-girl]

Hello all,
May I ask if the use of "that" is redundant or wrong in the sentence below?

I also have to say that I like the direction our friendship is going. What I mean is that our mutual respect and mutual understanding, along with valuing each other and respecting one another's privacy, has really made it possible to build such a long-lasting and strong friendship, which we hope that will last a lifetime.

I wrote it myself.

 

[Rover_KE]

It's both wrong and redundant.

 

[ambitious-girl]

It's both wrong and redundant.

Thank you.
I hope you don’t mind me asking, but I don't know why the use of "that" is wrong there when we can use "that" along with "hope".
For example:
We hope that more women will decide to join the course.

 

[emsr2d2]

The difference is that in your original post, the word "which" precedes the rest of the "hope" sentence.

We hope that this will last a lifetime.
This is something which we hope will last a lifetime.

 

[yi-ing]

It is a little ambiguous to me as "which" refers to "friendship while "that" relates to the verb "hope". Why the use of both of them in a sebtence is wrong?

 

[tedmc]

Something will last a lifetime.
Something, which we hope, will last a time.

"Which we hope" is extra information added to the first sentence, which you can do without.
So, can you see why your "that" does not fit into the sentence?

 

[Raymott]

Yes, except that your second phrase is not a sentence. The following are correct.
"This is something that/which will last a lifetime."
"This is something which we hope will last a lifetime."
"This is something which, we hope, will last a lifetime." (What is added is "we hope", not "which we hope".)

"Something will last a lifetime."
"Something, we hope, will last a lifetime." Grammatical, but not very meaningful.