My husband was diagnosed with Lewy Body Dementia 8 years ago, he has been in a care home since 1 April 2016 following a knee replacement operation which affected his dementia. He is insisting on going home but in July it was agreed by a social worker and psychiatric nurse that he should stay at the home. Unfortunately they didn't tell him and now the Deprivation of Liberty are involved in assessing him. This is all taking time and in the meantime he is very aggressive with me, verbally now but it was also physically when he first went in there and on the odd occasion at home. I am at my wits end!
The assessment will take time because the supervisory body (the local authority in this case) has to ensure that prior to authorization, all the specific assessment criteria have been met (this is part of the safeguarding process) and that the DOL will not unlawfully deprive your husband of his liberty. Sometimes even if decisions are made in a person's best interests, it doesn't mean to say that they are lawful and so care has to be taken not to violate any laws.
An additional thing to note is that once the assessment is complete, and providing that the application has been approved, the local authority has to appoint what is called a relevant person's representative. It is an additional safeguard as per the provisions contained in the Mental Capacity Act. Family members can be appointed as RPR's, or it can be someone else, as otherwise appointed by the supervisory body.
Here is a link with more information about the RPR.
http://www.cloverleaf-advocacy.co.uk/content/relevant-persons-representative-rpr
I can imagine that this is a very challenging situation for you because of the way in which your husband's behaviour fluctuates on a day to day basis, thus making the assessment so much harder. In any case, I believe that the supervisory body has to complete the assessment within 21 days.