Joey Votto played 169 games at AA and AAA in the minor leagues. The Reds were patient with Votto, and it paid off for them. Votto recently said in an interview that at the time he was upset with the Reds for waiting so long to call him up, but that it helped him develop a mentality that he would never get sent back down.
Nick Senzel has played 79 games at AA and AAA. He has been hot over the last few weeks, but still only has an .809 OPS so far in 2018 at Louisville. The popular opinion here at RN is that the Reds are being ridiculous for not calling up Senzel yet.