How long have you collected ...
这是现在完成时,强调这件事现在已经完成了,问已经收集贝壳收集了多久,暗示接下来不收集了,或不收集的可能性很大.
How long have you been collecting ...
表示收集贝壳的事,从过去收集开始以来,直到现在还在进行中,也是问已经收集贝壳收集了多久,但明示现在还在收集,接着还将收集下去.
How long have you been collecting shells?与How long have you
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