Time-Sensitive Portkeys? (Was: Portkeys and Floo Network)

[Olivia]

No: HPFGUIDX 43230

Vera said:

"There seem to be different types of Portkeys and I think this is critical
to the question ... The Portkey that is used to transport the party from
Stoatshead Hill, however, seems to have been *time* sensitive. The party had
to be there by a specific time and it is announced on their arrival as the
'seven past five from Stoatshead Hill'."

I was under the impression that the party touched the portkey at a certain
time due to the careful planning of Wizard arrivals at the World Cup. The
Ministry of Magic was afraid that Muggles would notice a sudden wave of new
(odd-looking) people in the area so all portkey and arrivals by other means
were carefully coordinated.

I assumed that the portkey itself wasn't time-sensitive but that the MoM had
given specific assignments for arrivals.

...

By the way, I'm new to the list. Just wanted to say a quick hello. My name
is Olivia St. Claire and I hail from Maine. Having subscribed (and
unsubscribed) to several HP lists, I'm thrilled to have found one with so
much interesting conversation and debate.

Olivia