With this mod you can modify your sleep/wait scale up to 7 days based on what you want it to be. Unfortunately I do not know enough to make it say days in game but you will be able to sleep or wait in whatever crazy combo you would like. ex= if you set it to 75 hours your character will sleep for 3 days and 3 hours.
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Installation:

Select the one you want, unzip and drop into Fallout4/data/interface
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Compatibility:

Small edit to sleepwaitmenu. Will be compatible with any mod that does not overwrite this.
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Bugs:

None. Report any if you find them.
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Use:

You may reuse this as long as credit is given. If anyone knows how to make the damn thing say days let me know or edit yourself and upload, thnks in advance.

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Note:

Just found this out but the hours reset at 99 and then starts back at 10. when it does that each singles digit changes every 10 hours. At what would be 100 hours if you click up 1 click at a time you will click 10 times before 12 and so on. I do not know how to fix this, just wanted to pont it out before someone out it as a bug.