The more you latch on, the more milk supply you'll get
It depends on how you intend to feed the baby after the CL leaves? Latch on all the time or EBM through bottle? If you intend to latch on, suggest you start now, before CL leaves, to practise. For me, I latch him from day 1, so the CL woke me whenever baby cried (even if it's 2-3 times a night).
Yes, no doubt it'll very tiring, esp. during baby's growth spurt where he will feed every 1-2 hours. In fact, my baby had cluster feedings (feed for 1-2 hours) for 1 week during his 3/4th week growth spurt. Well, this is the way I choose to do it and still doing now that baby is 5.5 months.