A sharp rebound in Bitcoin (CRYPTO:$BTC) has lifted the value of Tesla Inc's (NASDAQ:TSLA) long-held stash, while the mechanics behind the crypto rally are raising a more important question for investors: How much of the move can last? According to Arkham data, Tesla holds 11,509 Bitcoin worth approximately $994.9 million, putting the company just $5.1 million short of the $1 billion milestone.