Jarryd Hayne has 20 weeks to prove he has what it takes to make it in the NFL after picking up a rookie contract with the San Francisco 49ers.The Detroit Lions and San Diego Chargers had also shown interest in the Hayne, but as predicted by Fairfax Media on Tuesday morning, the 49ers were the only franchise to offer him a contract guarantee of US$100,000 ($128,000).The 27-year-old made the announcement at a press conference in the Sydney CBD on Tuesday, five months after he quit the NRL to purse his dream of playing in the NFL.\It feels surreal