Hello Meeks,
 Having a breast procedure, in combination with a tummy procedure, is one of the most commonly performed combined operations. This is of course assuming you are pretty fit and well in the first place but for most people this is not really an issue.
Adding eyelids to the mix will increase the length of time a little bit but would normally be fine to do as well. I personally don't like combining thigh and arm procedures at the same time as breast and body work as the recovery process can be quite taxing and the complication rate (minor and major) does start to rise. 
There are some additional risks when surgery becomes extended over a longer time. Complications such as a slightly higher infection rate can sometimes go up but if you are being operated on by an efficient and highly qualified team in a accredited hospital facility your team will anticipate these factors in advance.
Having these procedures at the same time makes obvious sense with respect to time off work etc.
Feel free to send through some photos if you like to office@parkclinicsydney.com and I can give you a more informed opinion. Of course the best way to get the most accurate information is to call us on 1300669488. We're always happy to accomodate patients from the forum.
Best regards,
Alex