Time to Appeal in Wisconsin? Either 45 or 90 days.
In general, you have 90 days to appeal a "final decision" or Order from the circuit court. You should receive a Notice or Order from the court that judgment was entered setting forth that day or you can look up your own case on CCAP here: http://wcca.wicourts.gov/simpleCaseSearch.xsl
In counting the 90 days, you do not count the day the Order or judgment was entered. If the 90th day falls on a weekend or holiday, you have until the next business day to file your "Notice of Appeal."
HOWEVER, always be careful to watch for a "Notice of Entry of Judgment" from the attorney or party on the other side. If they provide you with this notice within 21 days after the judgment was entered, it shortens the time to file your Notice of Appeal to 45 days.
Whether the time limit is 45/90 days, in a civil case this time cannot be extended so if you have any doubts about the time to file contact an attorney ASAP. If you don't and your time runs, you can never file an appeal.
Where to Appeal? - In the Trial Court
Oddly enough, an appeal in Wisconsin begins in the trial court. A Notice of Appeal, Statement on Transcript and Docketing Statement are the three basic documents one files to begin an appeal. The first two are filed in the trial court, with copies to the other side and the Court of Appeals and the docketing statement goes to the other side and the Court of Appeals. In Wisconsin, appeals are a matter of right. If you timely file the Notice of Appeal and pay the filing fees ($195.00 for the Court of Appeals; $15-$25 for the circuit court clerk depending on the county) the Court of Appeals must take your case. Some fee waivers are available.
In Milwaukee County, there is a special appeals clerk on the ground floor of the courthouse that accepts filings for all the circuit courts. In other counties, you file an appeal with the clerk of the circuit court that made the decision you are appealing.
This web page has all the forms you need to begin an appeal. But if you really want to have any realistic chance of winning, at least consult with an attorney who does appeals. Filling out the forms is one thing, winning an appeal another. Whatever you do, make sure you file and pay the filing fees on time.