On a scale from 1 through 10 with 10 being extreme high maintenance in a modern handgun using smokeless powder, the 1911 is about a 9. If you plan on shooting it a lot you'll need to get a video that shows you how to disassemble and clean it (I bought the one from Wilson and it taught me what I needed to know). You can also find some less descriptive sites on the web that give you the general idea.
After shooting a revolver and switching to the 1911 I think you'll be amazed at how much cleaning one gun can require. After shooting about 250 rounds from my 38 caliber revolver and another 250 from my 1911 I find that it takes about five times longer to clean the 1911.
The difference is that you've got a lot of taking apart and putting back together to do. There are lots of nooks and crannies that need to be cleaned if you want to do a thorough job that keeps the gun reliable.
Then about once a year you need a complete cleaning of the lower end (i.e., the trigger, hammer, and related geegaws).
I have a Pardini 45 auto that is also used for target shooting, and it takes only about five minutes to clean it to the same degree that 25 minutes' work on a 1911 yields. If maintenance time is an issue, consider a SIG instead of a 1911.
If you don't customarily use gun cleaning spray or wear an apron and vinyl gloves when cleaning your guns, then you'll find yourself using them when cleaning the 1911.
By the way, don't get the impression that I don't like the 1911. I use it more than all my other guns combined. The reason is that the gunsmiths have figured out how to make it accurate enough and reliable enough for a shooting game called bullseye. There aren't many other 45 autos that are accurate enough for the job. Because of that connection to gunsmithing and competition, me and the 1911 are like a couple in an arranged marriage.