nano /etc/systemd/system.conf.d/local.conf
gives
[Manager]
DefaultTimeoutStopSec=5s
DefaultTimeoutAbortSec=5s
Added
nano /etc/systemd/user.conf.d/timeoutstopsec.conf
with
[Manager]
DefaultTimeoutStopSec=5s
DefaultTimeoutAbortSec=5s
and systemreload, reboot, same 90s time-out
same content in
nano /etc/systemd/user/timeoutstopsec.conf
also no success, still 90sec time-out on reboot.
I have only the first two lines in /etc/systemd/system.conf.d/local.conf, and nothing related to timeouts or nfs in /etc/systemd/user.conf.d/.
What you really should do is identify the cause of your delay and deal with it directly.
sudo journalctl -r -b -3
...
Aug 18 17:12:56 dellscsi80722 systemd[1]: media-NAS07.mount: Unmounting timed out. Terminating.
Aug 18 17:11:27 dellscsi80722 systemd[1]: Tell Plymouth To Jump To initramfs was skipped because no trigger condition checks were met.
...
The NFS share doesn’t unmount, apparently.
I’m a bit puzzled. I have read and reread the thread, I may be missing something, wouldn’t be the first time. 
However, you have got this advice from an actual developer:
Why didn’t you try at least? As @hui has pointed out, the file /etc/systemd/system.conf is there. You had a typo in your line:
…but there is no /etc/systemd/systemd.conf to set
In the correct file, the mentioned lines are already there with the default values, commented out with a hash. You just need to remove the hash and replace 90 by 5.
When ready to reboot, first check what’s using nfs: sudo lsof | grep nfs
No, it is not there in the current Tumbleweed with the current systemd. Of course, it does not prevent anyone from creating it if needed, even though it is discouraged, but it will have the same effect as creating drop-in.
What makes you think any of these options would have any effect on your problem? Did you even try to read man systemd.mount instead of some random page on Internet?
sudo lsof | grep nfs
[sudo] password for root:
lsof: WARNING: can't stat() fuse.portal file system /run/user/1000/doc
Output information may be incomplete.
lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/1000/gvfs
Output information may be incomplete.
xdg-deskt 1855 user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
xdg-deskt 1855 1856 gmain user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
xdg-deskt 1855 1857 pool-spaw user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
xdg-deskt 1855 1858 gdbus user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
xdg-deskt 1855 1880 dconf\x20 user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
xdg-deskt 1855 2102 xdg-deskt user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
xdg-deskt 1855 7927 pool-/usr user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
kded6 1893 user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
kded6 1893 1896 QDBusConn user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
kded6 1893 1897 QXcbEvent user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
kded6 1893 1909 threaded- user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
kded6 1893 1930 pool-spaw user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
kded6 1893 1931 gmain user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
kded6 1893 1932 gdbus user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
kded6 1893 1935 dconf\x20 user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
kded6 1893 7920 Thread user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
kded6 1893 7921 Thread user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
xdg-deskt 2046 user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
xdg-deskt 2046 2067 pool-spaw user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
xdg-deskt 2046 2068 gmain user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
xdg-deskt 2046 2069 gdbus user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
xdg-deskt 2046 2098 dconf\x20 user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
at-spi-bu 2085 user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
at-spi-bu 2085 2088 pool-spaw user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
at-spi-bu 2085 2089 gmain user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
at-spi-bu 2085 2090 dconf\x20 user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
at-spi-bu 2085 2092 gdbus user mem REG 8,2 55336 5272664 /usr/lib64/gio/modules/libdconfsettings.so
Checked before logged out of your (Plasma) DE session I wouldn’t expect to help. I anticipated you’d log out, then Ctrl-Alt-Fn to check logged in as root to ensure no file manager or other app should be touching nfs for any reason. From output provided, I suspect another try would be a waste of time; but, never say never.
OT
You may want to investigate then why the files provided by systemd are missing on your system:
ich@laptopneu:~> LANG=C zypper se -sif /etc/systemd/system.conf
Loading repository data...
Reading installed packages...
S | Name | Type | Version | Arch | Repository
---+---------+---------+-----------+--------+-----------
i | systemd | package | 256.4-2.1 | x86_64 | OSS
ich@laptopneu:~>
Even external search tools (not provided by openSUSE) lists this file as content of the actual systemd package (provided by openSUSE).
Because those files are not provided anymore by systemd.
You may want to read what “ghost” file in RPM is.
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