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In systemd 239, they have added a new service that handles suspending then hibernating after a given amount of time. This is easier than using external scripts since it comes built-in with this version of systemd. You can check systemd version with systemctl --version.
First, you have to define the delay time before the system wakes up and go into hibernation and that should be defined in /etc/systemd/sleep.conf
[Sleep]
HibernateDelaySec=15min
Here, what we care about is the last line HibernateDelaySec where you can define delayed time. As you see, I have it set to 15 minutes after suspending.
Lastly, we need to override the default suspend to execute suspend-then-hibernate instead of regular suspend:
ln -s /usr/lib/systemd/system/systemd-suspend-then-hibernate.service /etc/systemd/system/systemd-suspend.service
This will make systemd executes suspend-then-hibernate instead of suspend every time suspend is invoked.
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