You might remember the meaning of the character 申 with this easy mnemonic:
Our history book states that back in the day, people used to measure time by drawing a line (丨) through the field (田), sticking a branch in the ground, and calculating the sun's shadow (日) and its movement around the branch.
Using mnemonics to remember the meaning of Chinese characters like has a huge impact on how long to learn Mandarin it takes.