Since many years it's possible to configure SLAs for SecureChange Workflows. In earlier times, there was no option to disregard e.g. weekends. So if a step needed to be completed within 2 days, a problem was there during weekends: Step started on Friday afternoon and not worked on until Monday.
Today, a granular configuration is possible. It's done in SecureChange via Menu > Settings > SecureChange > Miscellaneous.

As shown above, it's possible to define business hours as well as business days. Additionally, there is an option to import / export further dates like e.g. public holidays. When exporting the list as CSV file, it should not be edited in Excel - the import will fail afterwards. It's recommended to modify this file with a simple editor like Notepad++ or similar. Then, the import is usually successful.
Please find below a sample for 2026 (Germany) that you can copy, modify and import into your TOS installation.
"name","from_date_yyyy-mm-dd","to_date_yyyy-mm-dd","comment"
"New Year's Day","2026-01-01","2026-01-01","Neujahr"
"Twelfth Day","2026-01-06","2026-01-06","Heilige Drei Könige (nicht überall)"
"Good Friday","2026-04-03","2026-04-03","Karfreitag"
"Easter","2026-04-05","2026-04-06","Ostern"
"Labor Day","2026-05-01","2026-05-01","Tag der Arbeit"
"Ascension Day ","2026-05-14","2026-05-14","Christi Himmelfahrt"
"Pentecost","2026-05-25","2026-05-26","Pfingsten"
"Feast of Corpus Christi","2026-06-04","2026-06-04","Fronleichnam (nicht überall)"
"Feast of the Assumption","2026-08-15","2026-08-15","Mariä Himmelfahrt (nicht überall)"
"German Unity Day","2026-10-03","2026-10-03","Tag der deutschen Einheit"
"All Saints' Day","2026-11-01","2026-11-01","Allerheiligen (nicht überall)"
"Christmas","2024-12-24","2025-12-26","Weihnachten"
"New Year's Eve","2026-12-31","2026-12-31","Silvester"