Extraordinary claims require some evidence. That is not "nitpicking". If I made a claim that Mitt Romney had three secret wives, you, and others would rightfully expect some evidence besides some chain email sent to me.
Most of the facts about Mitt Romney's service on that page are fairly easily verifiable, if overstated. In fact, you can find most of that information in
Mitt Romney's Wikipedia page. As for his 28 years of service, he seems to have one all that (and more) but it wasn't full time.
He did work as a volunteer on his dad's campaign and as an intern while his dad was governor -- but that was while he was a teenager and attending school.
He did serve the two year Mormon mission to France, this was completely full time and he received no compensation for it (from what I recall, the only thing the Mormon church pays for is the flight to France and then back home).
He was Bishop (essentially pastor of the church) of his
ward (local Mormon congregation that typically has from 200-500 members) from 1961-1986. This would have been his "second job", as he was working for Bain Capital during this time period. Mormon local church leaders are not paid.
He was a Stake President (a
Stake is comparable to a deanery or diocese, Romney was over 12 wards with approximately 4,000 members) from 1986-1994. Again, Stake Presidents are not paid by the LDS church; however, like when he was Bishop he was still working for Bain during this time period.
So, the sheet understates his church service, as it was 13 years as Bishop and Stake President rather than 10 but it also doesn't note this was a second job for him. And they are, essentially, full time jobs on their own requiring 30+ hours/week.
For the
Olympic Games, Romney said he would only take a salary if the games made a profit, so he essentially was unpaid during the time he was working and, on top of that, he and his wife donated $1 million to the games. After the Olympics made a profit, Romney accepted the money but gave it all to charity.
In Massachusetts (above article and Wikipedia) he again declined his salary and had it given to charity.