Question: Will my neighbour be able to dig their heels in and drag it on for months?
Answer: No, the Party Wall etc Act 1996 is in place to ensure your right to carry out the works to your property is maintained. Party Wall Dispute can therefore be resolved.
Upon serving Notice, your neighbour has 14 days to agree or dissent to the works, if this period lapses without any contact, you and your appointed Surveyor (after this stage dissent is assumed) will appoint a Surveyor on their behalf after giving further notice. You will then be able to carry out the works as normal.