Feeding schedules are customized to the cat's insulin and personal onset/nadir. With Lantus, onset is usually going to be around +2 so the first snack would be then. Some only feed about 4 meals per cycle, others do 6-10, some just free-feed. Depends on the kitty. Normally though you can feed every couple hours or so until nadir, then hold off on the meals until the next shot time.
With Panic, her onset was +2 and nadired around +6, so I gave her mini meals at +2, +4, and +5.