As it's written, no, it is not. It lacks a subject. The only possible subjects that correspond to the verb is I, we, you,and they. The example is one pronoun short of being a sentence.
This aeroplane has crossed the Atlantic Ocean many times.
34
1 time
The doctor warned him that too many hamburgers would lead to a heart attack.
I had lots of grime because I fell on our hiking trip in the forest many times.
There is no good sentence using the word creditor, unless that is how you make your living: That creditor keeps calling, no matter how many times I tell them that they have the wrong John Smith.
There is not just one good sentence for "there," there are many.
3 times!
0 times
Paul Revere warned many cities but the first one he warned was Concord
There are many good shops in our locality.
As many times as you want, but I don't suggest it, and technically a sentence can go on for a long time so if you're asking how many times can it be said properly then there is no correct answer to our standards