>>>would like to know what the usual time is for a valid signed will to be completed
That really is a 'how long is a piece of string?' question. It's possible to get the whole lot done within a few weeks. (I was the executor and sole beneficiary of my father's estate and I obtained probate without using a solicitor. My father died in October and I had everything sorted out by the end of November). However 'six months to a year' is probably a more realistic answer when a solicitor is involved. Barmaid (who is a barrister specialising in civil law and, it seems, particularly in matters related to wills) has often posted here to say that some fairly straightforward wills can take years to get fully sorted out. So I certainly don't think that the period that has elapsed so far is unusual.
From the website of the Law Society:
"Dealing with the affairs of someone who has died can take a long time. It is not unusual for it to take up to a year, perhaps longer if things are not straightforward. Many organisations may be involved in the process, for example, banks, building societies, insurance companies and HM Revenue & Customs.
The estate cannot be dealt with until all claims to it have been received. Individuals have six months from the date when probate was granted to make claims against the estate.
Other things that may affect the time taken are:
whether the financial affairs of the person who died were in order;
what the person who died owned and where it is;
whether the person who died had an interest in a business or a farm;
what the will or the rules of intestacy say;
whether there are any legal disputes (claims against the estate or claims by the estate);
whether inheritance tax needs to be paid; and
making sure that all HM Revenue & Customs files are closed and that matters relating to income tax, benefits agencies and pensions have been sorted out.
Arguments between family members, beneficiaries or personal representatives can also delay matters. Any disagreements must be sorted out before the affairs of the person who died can be settled. "
>>>the solicitors will be collected fees and thus depleting the estate
The solicitor's fees will certainly come out of the estate but the fee charged for each action will be the same irrespective of whether that action occurred within days of him being tasked with the job or many months later, so there's no reason why you should expect any greater fees just because the solicitor might have been a little tardy in carrying out some of his duties.
>>>will we be given a copy of all incomings and outgoings when it is all finally settled
The grant of probate will be a public document for anyone to see. The solicitor should make details of his fees available to anyone with an interest in the estate.