This is a secondary period of mourning, meaning 30, because it lasts for 30 days. Mourners will resume normal social and professional duties but are still restricted in certain ways. A mourner should not cut their hair during this time, men are not allowed to shave or attend social events or even religious celebrations.
Found on
http://www.goldsteinsfuneral.com/glossary/
Thirty-day mourning period.
Found on
https://www.encyclo.co.uk/local/23058
(sh’losh-sheem) The thirty days following burial (including shiva)
Found on
https://www.encyclo.co.uk/local/23062
No exact match found.
