According to the below paper, the coronavirus spike protein sequence was available to scientists by end of february 2020 - the begin of march 2020 timeline. I had this question that why does sequencing of a virus protein take so much time (I am a software engineer, currently studying molecular biology to better understand the pandemic, hence I am seriously unaware!) ? The reason of asking is because, in case of another epidemic, we might need to spend again a lot of time to sequence the protein. This might be a real concern!