The MLB Draft is the longest one out of the major sports leagues as it extends all the way to 50 rounds, though teams can pass when they want to end their selections. Some teams have concluded their proceedings in the 30s in previous years and others in the 40s, but most usually go all the way to 50.
So when the second day gets under way at 10 a.m. MT the Rockies will need to wait for a few minutes until things get to the 77th overall selection. The Pittsburgh Pirates start the day with the 61st overall pick, one day after taking Gerrit Cole with the No. 1 overall selection.
They will then wait until the 107th overall pick, which comes in the third round, to select again. In the fourth round, the order stabilizes with the absence of compensatory rounds. The Rockies will select 17th (138th overall) in the fourth round and from there on out.