Hi! Welcome to the Wilfred the waffle pattern! It works up within a couple of hours and works in a variety of yarns. For this pattern i recommend going down a hook size or two than what you'd normally use to avoid holes.
For double knit yarn I'd recommend using a 2.5mm or 3mm hook
For aran/worsted weight I'd recommend a 3.5mm or 4mm hook
For a normal chunky baby yarn I'd recommend a 5mm hook
For a blanket yarn- super chunky yarn I'd recommend using a hook between 8 and 12mm, these yarns can vary quite a lot so if it's a thinner blanket yarn size down and if it's a thicker blanket yarn size up.
These are just recommendations and you may need to make adjustments depending on your tension.
If you have any questions when you're making Wilfred feel free to reach out, either email me (tinycrochetedthings1@gmail.com) or dm me on Instagram (@tinycrochetedthings)