......this will result in being granted a UK visa valid for 33 months.
Shortly before the end of that period, application can be made to stay for a further 30 months provided all requirements continue to be met.
After completion of 5 years in the UK, as the partner of someone who is a British citizen or settled in the UK, then application for settlement can be made. This is known as Indefinite Leave to Remain (ILR).
Look here at The Settlement page if you want more information about ILR.
The holder of a UK Partner Visa is allowed to work and to have access to the NHS, but is not allowed to receive any public funds until ILR is granted.