How long does it take for a will to be ready for reading?

I'm sorry for your loss.  Will readings are not typically done any longer.  Once the will is offered for probate, the personal representative is required to provide notice to beneficiaries of the estate administration and send you a copy of the will.  It's possible that your brother has already offered it for probate and didn't tell you.  You might consider calling the register of wills and ask if your mom's will was offered for probate.  If he hasn't, you can present a petition seeking to compel him to produce the will and offer it for probate.  So the timing is something you can control.  That all being said, some assets do not pass according to the will.  Assets held jointly, such as bank accounts, might pass to the surviving account holder.  The contents of the will won't change that.  So probate might not be all that important in your Mom's instance.  I'd need to know much more information about the titling of the accounts and mobile home to answer more specifically.  Retain counsel to send your brother a letter demanding a copy of the will.