I agree with everyone else, I wouldn't wait until August, unless there is some reason you absolutely can't do it any sooner. I would try at the min the middle of July. Because you can't really count on anything, including having his surgery postponed, so 4 weeks doesn't give you much time especially since kids seem to get postponed ALOT for emergencies, babies born with chd needing emergency surgery, bump everyone, or if it is a center that does transplants a heart being available right before your sons schedualled surgery ect. Justin's last 2 surgeris were cancleled 2 and 3 times (and his 3rd surgery HE bumped a couple kids). As for regular everything goes perfect surgery, Justin had surgery the first week of Dec when he was 10 (I never would have picked that date but it was an ER the day after a cath) he was home in 7 days and went back to school in Jan after the holidays, he did fine, BUt had a really good surgery/recovery. He was a little tired the first couple weeks back, he probably would have been better with another week or so home, but wanted to start with the new semester and they knew he might come home early or stay home if he was too tired. I can't remeber exactly when he felt really good , but know h e started basbeall practice in March with more energy than the year before.
He had surgery schedualled for the first week of March in 11th grade, but went to school until the last min, ended up getting sick so surgery was postponed then the surgeon postponed it 2 more times, Since he got sick right before the 1st date they told him to stay out of school until after surgery,, he ended up not having the surgery until May 3rd, so ended up having the whole semester homebound and didn't go back unitl the next fall.
2 years after that he needed surgery again, we schedualed it for June 5th because that was the first date we could get after school was done. It was postponed at the last min and postponed 2 more times (babies born that needed er surgeries) he ended up having surgery on the 19th and was home on the 22nd of June, which would have been great going back to school-wise, but then 10 day later he was readmitted for an infection, had another surgery and was in the hospital until July 7th. He went to Cooperstown for Cal Ripkens Hall of Fame ceremony about 3 weeks later, but was pretty wiped out and spent lalot of the time being pushed around in a wheel chair.
AS for which surgery they are recovinging from, I know alot of people say each one is worse but honestly that wasn't the case for Justin, his first surgery he was in the hospital a total of 5 weeks (but that included not having surgery until he was 10 days old , then having pyloric stenosis surgery (stomache) a week later. AND that was 20 years ago, when everyone was in much longer still they were still in the beginning of alot of the complex CHD surgeries. his 2nd the Rastelli, he was in and out of the hospital for the next 6 months with all kinds of issues, pericardial fluid, RVS ...
His 3rd and 4th were great he was in the hospital a week or less and by 6 weeks was better than ever. The 5th surgery he was doing really good too, until he hit that major bump with the infection.
PS I wanted to add, I was just thinking, IF he goes back to school a little less than 4 weeks, he will most likely have all kind of retrictions won't be allowed to go out for recess, lunch,gymn ect but at 6 -8weeks, he would be more likely to be allowed to do more of what his 'normal" is as far as does he have any restrictions ect (Justin's didn't really have any) I don't know how your son is but Justin always pushed the limits and I would have been nervous about sending him to school when he still had alot of restriction, heck after caths when most kids were told to "take it easy" Justin ped card had to tell him he couldn't do much of anything beside video games, because Justin's idea of taking it easy were no where near what the docs meant, so to avoid any thing stupid, they just told him he couldn't do anything for a couple days.
Plus IF I sent Justin to school the beginning of the school year when you just get to see all your friends after a couple months he would have been miserable if he couldn't go out at recess ect.