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#You are correct, but it's not gamebreaking

You have listed the only circumstances the DMG provides with regard to when the Roc-like creature will disappear, but also note Magic Items: Quaal's Feather Tokens limitations (DMG, "Magic Items", Quaal's Feather Token: Bird)  :

The bird has the statistics of a Roc (MM, Roc), but it obeys your simple commands and can't attack.

##Untrained mount with a large carry capacity Whether or not it can carry an entire party and their belongings is also up for discussion. Mounts don't discuss multiple riders and a concern about fast party travel speed is definitely limited by who can 'ride' the Roc. Having a transport that can only have a single rider (and remember, this is an untrained mount) and is capable of carrying a lot of objects really gamebreaking?

##But that fly speed (and other considerations) Yes, 120 is a very fast speed, but that's a fairly easy thing to mitigate if there is combat or threats in the air. Alternatively, not always having the airspace for your PCs to play in is another obvious option. Hard to bring a Gargantuan creature inside :)

##Simple Commands Only The Roc only has an INT 3, which implies it is not an intelligent creature that can act independently and can only

obeys your simple commands.

##Duration Theik's answer brings up a very interesting discussion. What is meant by >disappears after flying its maximum distance for a day Does that mean:

1. Disappears after flying its maximum distance for a day (144 miles)
2. Disappears after flying its maximum distance for a day (144 miles in a day)

#1 is what Theik is proposing, but #2 is an equally valid interpretation. However, as Tiggerous commented, why include the "day" language if the limitation is simply 144 miles? BY including it, it suggests that #2 is the correct interpretation.

Anchor For the next 24 hours

Fan ...for 8 hours. You can dismiss the fan as an action.

Swan Boat The boat remains for 24 hours and then disappears.

Tree Forever.

Whip The whip disappears after 1 hour, when you use an action to dismiss it, or when you are incapacitated or die.

##Hungry hungry hippo While this bird was created by magic, it's a bird with the stats of a Roc. And a Roc's gotta eat, just like Find Steed. And they mostly eat a LOT of food

You are correct, but it's not gamebreaking

You have listed the only circumstances the DMG provides with regard to when the Roc-like creature will disappear, but also note the limitations of Quaal's Feather Token: Bird (DMG, p. 188):

The bird has the statistics of a roc, but it obeys your simple commands and can't attack.

Untrained mount with a large carry capacity

Whether or not it can carry an entire party and their belongings is also up for discussion. Mounts don't discuss multiple riders and a concern about fast party travel speed is definitely limited by who can 'ride' the Roc. Having a transport that can only have a single rider (and remember, this is an untrained mount) and is capable of carrying a lot of objects really gamebreaking?

But that fly speed (and other considerations)

Yes, 120 is a very fast speed, but that's a fairly easy thing to mitigate if there is combat or threats in the air. Alternatively, not always having the airspace for your PCs to play in is another obvious option. Hard to bring a Gargantuan creature inside :)

Simple Commands Only

The Roc only has an INT 3, which implies it is not an intelligent creature that can act independently, and it only "obeys your simple commands".

Duration

Theik's answer brings up a very interesting discussion. What is meant by "disappears after flying its maximum distance for a day"? Does that mean:

1. Disappears after flying its maximum distance for a day (144 miles)?
2. Disappears after flying its maximum distance for a day (144 miles in a day)?

#1 is what Theik is proposing, but #2 is an equally valid interpretation.

However, as Tiggerous commented, why include the "day" language if the limitation is simply 144 miles? By including it, it suggests that #2 is the correct interpretation.

• Anchor

  For the next 24 hours

• Fan:

  ...for 8 hours. You can dismiss the fan as an action.

• Swan Boat:

  The boat remains for 24 hours and then disappears.

• Tree:

  Forever.

• Whip:

  The whip disappears after 1 hour, when you use an action to dismiss it, or when you are incapacitated or die.

Hungry hungry hippo

While this bird was created by magic, it's a bird with the stats of a Roc. And a Roc's gotta eat, just like a steed from Find Steed. And they mostly eat a lot of food:

##Untrained mount with a large carry capacity Whether or not it can carry an entire party and their belongings is also up for discussion. Mounts don't discuss multiple riders and a concern about fast party travel speed is definitely limited by who can 'ride' the Roc. Having a transport that can only have a single rider (and remember, this is an untrained mount) and is capable of carrying a lot of objects really gamebreaking? Probably not, and even if you've got a 'puzzle' where your players have to figure out how to return a heavy object to another location, this is a great solution for a one-time use Rare magic item.

##Untrained mount with a large carry capacity Whether or not it can carry an entire party and their belongings is also up for discussion. Mounts don't discuss multiple riders and a concern about fast party travel speed is definitely limited by who can 'ride' the Roc. Having a transport that can only have a single rider (and remember, this is an untrained mount) and is capable of carrying a lot of objects really gamebreaking? 

Probably not, and even if you've got a 'puzzle' where your players have to figure out how to return a heavy object to another location, this is a great solution for a one-time use Rare magic item.