Considering Holley sniper EFI for my 1969 340. Thoughts from people who have that set up?

My question is how much does the in tank pump heat the fuel?

If the fuel is cooling the pump then it has to increase the fuel temperature. How much and how long it takes is also a question.

In my head, the temperature increase would be at low load, long duration driving where the pump is bypassing fuel at its highest rate.

I could be wrong but maybe someone has tested for that.