PIP appeal

I have been on DLA for many years. I lost my DLA during the transfer to PIP. When I found out that my application had been turned down it felt like somebody told me that I was dead. My whole life depends on the use of my Motability car. I will be absolutely housebound without my car. I am soooo worried about what is going to happen. I requested Mandatory Reconsideration and the decision stayed the same. I don't think my long letter explaining the issue was even looked at. I am now going to appeal (am aware of the timescale) but I don't know how long the appeal process could take from the time you ask for it. I would appreciate any information you could share with me on this. Many thanks.

Thanks for your reply. You have said that there is less emphasis placed at the appeap on the assessor's report , does that mean there will be more emphasis on my grounds for appean and any evidence submitted? Thanks