It's a fantasy role-playing game.

DM: You are Keyleth, a half-elf druid . You are the member of the famous group of adventurers. Previously, Scanlan then asks the final question, from one father to another. The questions having been asked and the magic fading, the body reverts to its lifeless state.
DM: If you're doing a 40-foot square it could be like 20 feet lower for every 40-foot square you can do, yeah.
Player: Yeah. Yeah. So real deep.
DM: Okay. So we'll say over the two-hour period you could create, for a 40-foot square, like a hundred feet deep, 120 feet deep--
Player: I want to make sure it's wide enough to cover the whole entrance as well.
DM: The whole entrance? Okay. So you dig underneath. Stealth check to get close enough. Because in digging, it'll take you most of that duration to dig up to the gate.
Player: Uh-huh. Underground.
DM: Yeah. I'd say, so in order to do this, you have to actually get fairly close before you start digging down there.
Player: I rolled a 19.
DM: 19?
Player: And I have a stealth of 11.
DM: Okay. All right, so. You make your way up there, moving through the grass best you can. The guards that are there are partially (yawns) coming to, you begin to slowly manipulate downward into the ground using a relatively untouched patch of high grass for cover, and pushing your way through. Over the next two hours, you manage to dig a ditch, the width of this entrance is about 40 feet.
Player: Okay.
DM: So from end to end, if you just go straight down from there at 20 feet per section every ten minutes, looking at 240 feet deep if you wanted to go the full, although, actually, having to tunnel underneath would probably take-- we'll say 180 feet.
