And it's been even longer since it was revealed he had molested five underage girls as a teen, including younger sisters Jill Duggar and Jessa Duggar, a scandal that prompted TLC to cancel the Arkansas family's hit reality show, 19 Kids and Counting.
While Jill and Jessa have been active on social media, Josh and Anna, both 27, have been MIA for about a month. Anna and their four children made an appearance at cousin Amy Duggar's wedding last week, as did Josh's parents and siblings.
So where's Josh?
"He is still in rehab," a source told E! News exclusively. "And Anna is still by his side supporting him."
Despite pleas from her own brother to leave Josh, Anna is relying on encouragement from family members to remain committed to her marriage, the source said.
"She isn't in Arkansas," the source told E! News. "She is getting support from her family. She is staying with her mom."
Meanwhile, Jill, 24, husband Derick Dillard, 24, and their baby son Israel recently returned home after going on a Christian mission in Central America. On Saturday, Dillard shared a pic of the three dressed as pirates for Talk Like a Pirate Day.
"They are home for a while before they go back on a new mission," a source told E! News. "They are doing training and preparation for the next missionary trip. They are looking to do full time missionary work."
Jill has been in good spirits, while the topic of Josh was "the big elephant in the air," the source said.
"People came up and gave them and the baby a warm welcome," the source added. "They are moving on with their lives. They are out and about in the community. They look very happy and a little tan. They came to church with the baby. He looked adorable."
And Jill currently has reason to celebrate—she recently got certified as a professional midwife.
"I am so proud of her for her diligence, perseverance, and hard work to see this long road through to its end and reaching her goal of becoming a CPM," her husband wrote on their blog on Friday.
Jessa, 22, congratulated her sister, posting on her Instagram page a pic of Jill and her husband and son alongside a celebratory sign on a house door.
Jessa is currently about eight months pregnant. She and husband Ben Seewald, 20, are expecting their first child, who will be the sixth grandchild of her parents Jim Bob Duggar, 50, and Michelle Duggar, who celebrated her 49th birthday last week. Her kids filmed video greetings for her, which were posted on the Duggar family website.
"You're always pointing us to Jesus and I know that's your rock, in tough times," Jessa says. "I love you so much and I look up to you."
As a result of the cancellation of 19 Kids and Counting, Jessa is the first member of the family not to have her pregnancy documented on TV. She has, however, kept her fans up-to-date with Instagram photos.
They have not revealed the baby's sex and have asked fans to make their guesses on their website.