The safest thing to do is bring forward an oil service to re correct the levels ASAP but of course what happens between now and then?
I had to consider this myself but fortunately I was (luckily) conservative with my filling so no problems were caused. You have 2 things to consider.....
1) 3/4 of a litre spread thoughout a warm engine doesn't necessarily amount too much extra capacity in the sump but it will of course depend on how low was low on the dipstick when you started?
Consider that the dipstick level was engineered to withstand some error.
2) A serious overfill may show blue smoke from the exhuast.It will also aerate the oil as it get whipped up by the crank and that has a frothy appearance on the dipstick. That will actually starve the engine of proper lubrication.
So its really about your low starting level.
Min to Max on the dipstick is 1 litre but i'm not sure if thats when at operating temp or when cold. Filling to max when cold (as you realise) will take more than filling at operating temperature.
So rethinking your problem...3/4 of a litre to max when cold turns into how much to max when warm? plus how much room for error has been allowed by VW?
I would hate to advise you and be wrong but my guess is that you would not have overfilled at half that amount because warm oil wont expand that much. So now we are talking about overfilling by 375ml instead of 750ml.
That a coke can plus a bit which I suspect would hardly show in the sump level.
No dashboard engine warnings?
Ever actually known anyone damage an engine by inaccurate oil filling (i'm not talking total neglect of course) but apart from the sensation of the internet it can't be as common couse engine damage as it is to overfill without engine damage or we'd all know someone who did it right?
OIl expansion is not huge.
I'm not going to say drive it but if you do, get it up to operating temp and check the dip stick for frothy bubbles. Then wait for 10 mins, check the level. If the heated oil hasn't expanded above the max you are in good shape though I would continue to check this for a couple of journeys myself.
If you have engine warnings dont drive.
Extra noises dont drive.
Frothy dipstick dont drive.
DAMN modern cars!!!! Good Luck.
What was ever wrong with checking them cold.
VWGuru ???