Hi There!
I will attempt to answer a few of your questions using the
distance chart,
the world map, and
this offline site. This site claims a Black Leopard can move 25-50 miles per day. If someone of a higher positions comments, I bow out to their answer.
Spires ->>> Avanthal
The Spires to Avanthal is approximately 750 miles. Assuming a black leopard can move from 25-50 miles per day, you can assume it would take 30 to 15 days. This is not taking into account the weather and geographical layout.
Spires ->>> North Suvan Sea
See below. If you meant directly to the Suvan Sea, I used the Spires to Sultros to line up with the Spires to Karjin. This is 1250 miles. Dividing 1250 by 25 and 50, you can estimate it would take 50 to 25 days. Please note, Karjin is not open to roleplay and this does not include outer influences, such as weather and geographical information.
Spires ->>> Denval
Unfortunately, Denval was blown to bits in the Djed Storm of 512. This domain is no longer open for present-time threads. As I can only assume you meant to go from Denval to Alvadas, so I will calculate for the Spires to Alvadas.
The Spires to Alvadas is approximately 1675 miles. Taking the estimate that a Black Leopard can move 25 to 50 miles per day, you can assume it would take 67 to 34 days. Please, bear in mind the geographical differences and weather, etc.
North Suvan Sea ->>> Syliras
Going with the same logic, I can assume you meant to go from Alvadas to Syliras. Alvadas to Syliras is 1375 miles by boat. By chat's logic, a Mizahar boat would be able to go 5 to 8 knots per hour. If the boat travels at least 12 hours per day at 6-7 knots per hour, you should arrive in Syliras in an estimated 20 to 17 days. Please note, this does not include weather or any or influences.