@JeremyECrawford some battle master maneuvers specify size limitations of targets, are these limitations meant to be hard caps or should they change when a character is enlarged?

— omegapulsar (@omegapulsar) December 18, 2017

If a game feature specifies creature sizes, those are the sizes the feature is intended to work with. Any change is up to the DM. #DnD https://t.co/iMxxdvzzd1

— Jeremy Crawford (@JeremyECrawford) December 18, 2017

@JeremyECrawford Happy Holidays, Jeremy! Q: Malleable Illusions allows you to change the nature of an illusion, using its parameters. Can the location of a Hallucinatory Terrain or Mirage Arcane (or other) be moved? Or is it constrained to the original area?

— Thujoned (@Thujoned) December 21, 2017

@JeremyECrawford You normally don't answer ? on UA archetypes, wanting the thoughts in feedback surveys.

— John Appleton (@jaa0109) November 7, 2017

Now that we know which didn't make the cut in XGtE, since some players still like those archetypes which didn't make it, will you take ?'s ?

— John Appleton (@jaa0109) November 7, 2017

My priority is answering questions about things that are officially in the game.

— Jeremy Crawford (@JeremyECrawford) November 7, 2017

@JeremyECrawford With the Pact of the Blade + Improved Pact Weapon, I can conjure a Longbow and use that for Eldritch Blast. Since I'd be using that weapon to make attacks, would that allow for Eldritch Smite during Eldritch Blast? Only asking since it doesn't say weapon attack.

— Juicyman (@OdangoKnight) January 29, 2018

Using a weapon as a material component for a spell, including as a spellcasting focus, doesn't count as attacking with that weapon, unless the spell explicitly says you attack with it. #DnD https://t.co/uXo9vWc1Rd

— Jeremy Crawford (@JeremyECrawford) January 29, 2018

Weapon of the war mage "used" by arcane trickster to get sneak attack on a spell attack? (Sneak attack uses weird verbiage)

— Nathaniel Kreiman (@NKreim) January 29, 2018

Using a weapon as a spellcasting focus doesn't count as attacking with the weapon. You're channeling magic through the weapon; you're not striking with it. #DnD https://t.co/OwUgJ9pbs0

— Jeremy Crawford (@JeremyECrawford) January 30, 2018

A turn is 6 seconds. An action is implied to be longer than a bonus action, which is implied to be longer than a reaction, with conditional exceptions. This breakdown therefore was logical, and is the general framework most such questions are answered with on rpg.stackexchange A turn isn't 6 seconds. A round is, and even a round isn't precisely 6 seconds. The rule intentionally says "about 6 seconds." A round contains multiple turns. Turns are assumed to have variable lengths within the round framework.

— Jeremy Crawford (@JeremyECrawford) January 12, 2018

Turns take place simultaneously on the same round as per your earlier tweets, thus they last the full round (afaik this is what the League works with). To answer the original question, ‘about’ must be defined contextually, since the question arises from ambiguity. A turn is an abstraction and is not assumed to last for an entire round.

— Jeremy Crawford (@JeremyECrawford) January 12, 2018

This begs the question of what a turn/action are & what in-world dynamics give both those terms universal logical consistency e.g. what necessary similarity is there between swinging a sword and casting a spell? That’d be up to the DM at that point as it affects worldbuilding. An action is a significant thing you do when it's your turn to act during a round. It's fundamentally a narrative and game categorization, not a temporal one. The game tells you that during a round, you can normally pull off one of these significant things.

— Jeremy Crawford (@JeremyECrawford) January 12, 2018

Further clarification about time in combat: a round in D&D lasts for about 6 seconds. That's a round, not a turn. A round is made up of a variable number of turns, and those turns don't have a number of seconds assigned to them by the rules. #DnD https://t.co/smlSuXgTVh

— Jeremy Crawford (@JeremyECrawford) January 16, 2018

That seems wrong. So if I prone someone until the start of my next turn, that could be 12 seconds or it could be 60 seconds from the moment I did it, depending on how many people are standing around?

Also what about spells with durations measured in minutes?

— Bryan Holmes (@FallenWyvern) January 16, 2018

A round lasts around 6 seconds, no matter how many turns take place within it. #DnD https://t.co/1dpvy4uRL3

— Jeremy Crawford (@JeremyECrawford) January 16, 2018

@JeremyECrawford Does the heal blocking effect from Chill Touch prevent a slain Troll from returning to life on the following turn, or can it still "regenerate" even though it gains no hit points?

— Jake (@Jakken109) January 5, 2018

The Regeneration trait must restore at least 1 hit point for a troll, or another monster with the trait, to regenerate. #DnD https://t.co/N3Bp9EaHpJ

— Jeremy Crawford (@JeremyECrawford) January 5, 2018