I took it during the summer last year with zero problems whatsoever. Unless its one of those accelerated like 6 week or something classes then I wouldn't worry about it. Mine was about the same length as a normal semester except we met 3 times a week instead of 2 to offset the slightly shorter run.
My professor was extremely slow though, spending an obscene amounts of time just on limits. As a consequence we didnt get as far through as some other classes thought the part we missed overlapped with calc 2 so no problems there.
I love summer and I've never had a problem with the faster pace. I've taken Calc 1, Computer science,philosophy and am now taking circuit analysis.