According to the information provided, there is no specific time of day recommended for taking aspirin for prevention purposes. The Mayo Clinic states that low-dose aspirin, when prescribed by a doctor for prevention, can be taken at any time of the day [${2}]. However, it is important to note that aspirin therapy should only be initiated under the guidance of a healthcare professional, as it carries the risk of certain side effects, such as gastrointestinal bleeding [${2}]. Furthermore, a recent study published in the Journal of Clinical Medicine found that the timing of aspirin intake did not significantly affect its cardiovascular benefits [${3}]. In summary, there is no need to take aspirin at a specific time each day for prevention, but it should be used under medical supervision.

Sources:
[1] <https://www.drugpatentwatch.com/p/tradename/ASPIRIN>
[2] <https://www.mayoclinic.org/diseases-conditions/heart-disease/in-depth/daily-aspirin-therapy/art-20046797>
[3] <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8952565/>