Hello, Stefan.
Here is my experience with the script.
I started the script on Monday 2015-03-30 1347. I used the script that included the timeout of 86400 seconds.
I checked the script’s progress on Monday 2015-03-30 2220. It was still running. Calendar was running, but, was neither visible nor responsive. I did not interact with Calendar or the running script, further. No other applications were running.
This morning, at 0600, sixteen hours later, the script window was not visible, nor, was the script icon visible in the dock. Calendar was running, but, was neither visible nor responsive. I right clicked on the Calendar Dock icon. I don’t recall the message’s exact text, however, it suggested that Calendar was not responding. I selected Force Quit from the Apple menu. The Force Quit window contained the following messages, “Your system has run out of application memory. To avoid problems with your computer, quit any application you are not using.” The application list included Finder, Script Editor, and Calendar (paused). The Calendar letters were red.
I clicked on Script Editor, and then, I clicked on Force Quit. The Script Editor entry remained in the list. I clicked on Calendar, and then, I clicked on Force Quit. The Calendar entry exited the list. I closed this window, then, I performed a restart, without incident.
The restart appeared to be normal. I launched Calendar. I reviewed a few dozen All Day Events, at random, from the past five years. All of them still display alerts. (Sidebar: I own two iMacs and and iPhone 6. All three of these devices synchronize though iCloud. Therefore, I checked the Calendar entries on the other iMac, and, on the iPhone, this morning. Again, I reviewed a few dozen All Day Events, at random, from the past five years, on each of these two devices. All of them still display alerts.)
I wanted to provide my results to you, for evaluation, before I make any more entries in Calendar.
Thank you.
Kurt