I understand that there is difference in implication in present perfect between sentences with "for-phrase" and those without.
A sentence with "for" implies the state exists until now.
I have been in this company for 3 years (He is still in it.)
But a sentence without it implies the state has ended.
I have been in this company. (He used to work there but not any more.)
But I recently encountered this sentence:
Thanks for your message.I apologise for not getting back to your message,but I've been incredibly busy.
According to the theory above, the speaker isn't busy now. But I doubt it so I hope you will help me to make sure of it.
Thanks in advance.