Summer break - how to increase Fink volume?

so i am done with my first year of med school mid-may and that is also the last week of the build phase of the fink competitive plan. we have the entire summer off until the end of august so I will have 100% free time to train before vineman IM at the end of july.therefore, i have no time constraints for training and am wondering how people might recommend increasing volume without overtraining? i think that running volume likely should not increase very much but i see no reason why bike volume can't be increased. would you recommend increasing long easy rides or increasing the length of mid-week interval bike workouts so i can add in more intervals? or something completely different?thanks!alex