We can assume that a larger snail moves faster simply by nature of being bigger. If we assume the snail's movement speed scales linearly with its size we can estimate its speed.

In the image he is twice as tall as the buildings which appear to be about 4 stories tall. 14 feet per story, times 8 = 112 feet. A snail is about 1.5 inches tall.

112 feet is 1344 inches. Divided by snail height, this snail appears to be about 900 times larger than normal.

Humans sprint at about 14 mph. A normal snail moves at 0.03 mph. Multiply that by 900 and our giant snail clocks in at 27 mph! Better find a car if you don't want to drown in snail mucus.

The giant snails tried their invasion in the middle ages, but were fought off by knights. All that's left of them is some doodles in the margins of medieval manuscripts.

I shall gently perambulate in some direction other than directly towards it... unless I'm feeling feisty, and wanna try to ride that like a bad cowboy!? 🤠

Point of contention: Toho has only ever made good monster movies. This includes the bad ones.

Good thing I carry a 20kg bag of salt with me everywhere!

Looks like Peter forgot about relative velocity.

Reminds me of Invader Zim

Godzilla would make escargot from Snailax here

Big "Oh shit, the mummy's after us, let's all walk a little faster" energy

Aww…snails! Cute.