OP, if you don't like your attorney, either personally or professionally, consider getting another one. However, I wouldn't necessarily do it over this issue of lenght of spousal support.
I say that because in all liklihood, the court is simply going to make an order re support which may be modified in the future based on change of circumstances. The court will NOT (without your consent), order spousal support to continue for ANY period of time, in a non-modifiable way. The court will also issue what are called Gavron Warnings which will tell your wife that she is expected to become self-sufficient.
When circumstances change (you earn less, she earns more, her needs reduce (sometimes as a result of cohabitation), allowable hardships or deductions occur, etc.), you'll go back to court and get it modified.
You can also speak with your attorney about the possibility of a lump sum buy out of future support, or, some type of stipulated step down or termination over a period of time. It is sometimes better to resolve these matters by agreement, rather than by the luck of the draw, in court.