"How much is just so much?"
Translation:Cât de mult este doar atât?
There's not a single hit of this exact sentence in Google (using quotes around it to search verbatim - No results found for "cât de mult este doar atât"), not a one! So, either nobody else in the entire history of the Romanian language ever used this exact combination of words - and Duo is blazing new trails here - or it's of dubious quality. Mmm... I wonder if it should be replaced with something more useful, such as cât de mult e prea mult, "how much is too much".
We (and Duolingo) should probably put the quotation marks around "doar atât" to find it to be a popular albeit vague expression, see https://ro.bab.la/dictionar/romana-engleza/doar-at%C3%A2t
Probably, few Romanian speakers ask this exact question about a commun combination, but we foreigners should definitely try to get the gist of it. I could ask a friend but he would probably be of "just so much" use here :-) Does the latter make sense in English?