As an IC you should have some idea as to what your time lines are and what volume your choice in diapers are provideding
As a long time 24/7, U-IC, I have long know what volume of the diapers I use are capable of handling and how many changes during the day or night, I will need. Also, as stated above, using a barrier cream and powder helps.
I am guess you are attempting IC and are experimenting with extended diaper use. If so, I recommend that you look first at day time use and look at what volumes you are releasing at any given time and adjusting the capacity of the diaper you are using. You would be further ahead to be changing more often than pushing the capacity of your diaper. Over wetting may feel good, but leaks are a problem. Diaper rash is not a game and can be damaging to you skin if you are not working hard to stay ahead of its development. Here again, it is changing more often and obtaining and using a quality diaper rash cream /paste.
Remember that your skin is different and you should never hope that not wearing a barrier will be okay. Clearing-up a serous diaper rash can take anywhere from a few days to a few weeks and can be very painful!