The author of the Tanya wrote, “If God graciously grants him more”.
The simple understanding is that it is referring to more time.
The author adds that this is not necessarily an increase in free time that he can utilize to perform additional good deeds.
It can also be an increase in the sense of an improved intention and focus on matters that he already performs in those few free moments.
For instance, he may have a “good thought,” i.e., intention, that if he has more free time he will use it to study Torah.
Because God links this good thought to an action, it is reckoned as though he has actually engaged in Torah study the entire day and night.
Rabbi Adin Steinsaltz