Cutting the blocks is like eating the beans, a little at a time but more frequently compared to the gel. When I intend to go out from the start really fast and plan to continue that pace, I will down a gel around 15 minutes before I start. Then every 45 minutes or so there after. Again, this is only when I am really cooking, meaning that I am trying to maintain a pace in the upper 9:00s. Please remember, this works for me. When I walked the DL 1/2M with DW last month, I had a few sips of water and shared a Gu with DW. Ate my breakfast, drank plenty of water before hand and the weather was so nice I had no need to replenish. There can alsobe a problem if you drink too much water.