Missing DAYS in the Preload scheduled

### Impacted plugin

Super Cache

### Quick summary

This minor issue is in the preload tab message "Next preload scheduled in"
In version 1.10.0 it does not display the days (obviously in the case of preload settings greater than 1440 minutes).

### Steps to reproduce

In preload tab, set preload time to an high value, more than 1.440 minutes, and start preload.
You will notice that the "Next preload scheduled in" message will not display the days.

### A clear and concise description of what you expected to happen.

Should see days, hours, minutes and seconds

### What actually happened

No days displayed

### Impact

One

### Available workarounds?

No but the platform is still usable

### Platform (Simple and/or Atomic)

Self-hosted

### Logs or notes

it-IT translation
Sahifa theme