Hong Kong, a former British colony that retained a separate legal system when it returned to Chinese rule in 1997, has a long-standing extradition treaty with the US, but Beijing has the potential to veto any ruling.
However Beijing has appeared to distance itself from any decision on the possible extradition of Snowden, who is in hiding in the southern Chinese city after blowing the lid on vast US surveillance programmes targeting phone calls and Internet traffic.
Hong Kong lawmaker Alan Leong said that if local authorities proceed with extradition, it could result in a lengthy legal battle.
"If every appeal opportunity is taken, I suppose the process will last between three and five years" at the very least, he told AFP.
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The case could possibly drag "through at least the magistrates' court, the Court of Appeal and the Court of Final Appeal. So, at least three levels of (Hong Kong) courts," he said.
"If the court decides this man cannot be sent back, this is the end of it. He can't be sent back," he told AFP.
"But if the court decides he could be sent back, it is still up to the Hong Kong chief executive to decide whether to do so. This is when all kinds of possible considerations can come in," Gane said.
Experts have claimed that Snowden is testing Hong Kong's civil liberties under its "one country, two systems" framework by retreating to the former British colony.