gosh, last time I had trouble with 8GB data checking in, it's very memory hungry when the data set is big and then you need check them in all at once, how much

gosh, last time I had trouble with 8GB data checking in, it's very memory hungry when the data set is big and then you need check them in all at once, how much memory on the server side you need when you want to 'git add .' all the repo of 54GB? what about a re-index or something, will that take forever? I worry at such size the speed will suffer, I feel git is comfortable with probably a few GBs only? anyway it's good to know that 54GB still is usable!