\begin{tikzpicture}[node distance = 3cm, auto]
  \node [block] (init) {\footnotesize Mix \qty{50}{\gram} flour + \qty{50}{\gram} water, stir}; 
  \node [block, right of=init, node distance=3cm] (wait1) {\footnotesize Wait  \qty{24}{\hour}};
  \path [line] (init) -- (wait1);
  \node [block, right of=wait1, node distance=3cm] (feed) {\footnotesize \qty{10}{\gram} of previous day + \qty{50}{\gram} water + \qty{50}{\gram} flour, stir};
  \path [line] (wait1) -- (feed);
  \node [block, below of=feed] (discard) {\footnotesize Discard the rest};
  \path [line] (feed) -- (discard);
  \node [decision, right of=feed, node distance=3.5cm] (decide) {\footnotesize Is good?};
  \node [decision, above of=decide, node distance=3cm] (timeout) {\footnotesize Less than 10 feeds?};
  \node [block, above of=feed, node distance=3cm] (wait2) {\footnotesize Wait  \qty{24}{\hour}};
  \node [block, right of=timeout, node distance=3cm] (discard2) {\footnotesize Batch failed};
  \path [line] (timeout) -- node{no} (discard2);
  \path [line] (timeout) -- node{yes} (wait2);
  \path [line] (feed) -- (decide);
  \node [block, right of=decide, node distance=3cm] (use) {\footnotesize Ready to use};
  \path [line] (decide) -- node{no} (timeout);
  \path [line] (wait2) -- (feed);
  \path [line] (decide) -- node{yes} (use);
\end{tikzpicture}