kangaroos have claimed up to 115 bits.
I think that is a new world record but would have to research it to make sure. If so, the person who claimed the 0.115 BTC should get some fame for that - if they want the fame...
Since the jump size is limited to 64 bits it quickly becomes impractical to search ranges that are say 128 bits long without extending the code.
I estimate it would take at least 2^64 jumps for the program to get from one end of that particular range to another.