i realize mainlining is 'supposed' to strip so many leaves.. but try leaving a few more early on... it will power growth faster. can always clip them later or if they get in the way as needed. bend or tie them out in a different direction. light powers growth.. fewer solar panesl = less growth, incontrovertibly so.
Mainlining takes longer because they take so many leaves off and it's a pretty stressful training. heck, i've seen a plant stall just from normal LST. The benefit is the orgnization and airflow and.. etc... can grow healthier buds.
vege time shouldnt' impact how many harvests you get, as long as you hve a dedicated vege area. Just takes a little extra planning. So, the extra time is no problem for most.