When I installed Solus as one of the daily drivers on my desktop earlier this year, I discovered that one of my favorite tools to remind me to take a break wasn't available. As an interim measure, I installed Gnome Clocks, which has a number of clock functions, including a stopwatch function.
While Gnome Clocks worked, I considered it overkill for my needs. My favorite stopwatch app is called Stopwatch; description from the main site:
Stopwatch does what its name implies - enables hand timing much like a physical stopwatch. It can also be used as a countdown timer.
Stopwatch has millisecond accuracy and no artificial limit on hours.
Following is how to install and run Stopwatch under Solus.
01) From the command line open a text editor as superuser:
sudo -i name-of-text-editor
Go here and copy and paste the code into the text editor.
Edit the first line and change to read:
#!/usr/bin/wish -f
Save the file as /usr/bin/stopwatch.
02) Install tcl and tk from the Solus repos using eopkg.
sudo eopkg it tcl tk
I'm not going to provide guidance about how to setup a menu entry to start Stopwatch because I use Solus under the Openbox window manager, so I have very little experience setting up menu entries on the official Solus desktop environments.
However, Stopwatch can be started from the command line with a simple:
stopwatch &
The ampersand at the end of the above command forks Stopwatch as a background process.
Enjoy!