During the fight, 2 units of spiritual energy were used for the Plant Growth and another 4 units were used by the Energy Shield.
The Wood Control spell used the remaining 16 units of spiritual energy. So he still had 78 units left and could fight another golem or two.
He had used 9.33 seconds to approach the golem. Then 1 second was used to activate the Plant Growth and Wood Control spell.
After that, he waited for 2 seconds to activate the energy shield spell. He had mastered this spell completely, so it didn't take a long time for him to activate it.
The last 1 second after that was the time it took him to crash into the golem and bind it completely with his vines. This all comes to a total of 13.33.
This reminded him of what his second teacher in the Dyson family training facility had said about not needed up to 30 seconds to defeat an enemy. Now that he has achieved it, he agrees with her that 30 seconds is too much time to defeat an enemy.