die Reisezeit
travel time
The amount of time needed for a journey from one place to another.
Die Reisezeit von Hamburg nach München beträgt mit dem ICE etwa sechs Stunden.
The travel time from Hamburg to Munich is about six hours by ICE train.

travel time / travel season
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travel time
The amount of time needed for a journey from one place to another.
Die Reisezeit von Hamburg nach München beträgt mit dem ICE etwa sechs Stunden.
The travel time from Hamburg to Munich is about six hours by ICE train.

The word 'Reisezeit' (travel time/travel season) is a compound noun. It consists of 'die Reise' (the journey/trip) and 'die Zeit' (the time) and describes either the time needed for a journey or a period in which people travel.
Wir müssen die beste Reisezeit für unseren Urlaub in den Bergen finden.
We need to find the best travel season for our vacation in the mountains.
When referring to the duration of a journey, 'Reisezeit' (travel time) is often used with verbs such as 'betragen' (to amount to), 'dauern' (to last/take), or 'sich verkürzen' (to become shorter). People also speak of the 'reine Reisezeit' (pure travel time) without breaks.
Durch den neuen Tunnel verkürzt sich die Reisezeit um eine Stunde.
Thanks to the new tunnel, the travel time is reduced by one hour.
You can recognize this meaning from the context of seasons, holidays, or prices. Typical combinations are 'Hauptreisezeit' (peak travel season, when many people travel) and 'Nebenreisezeit' (off-season, when few people travel).
Außerhalb der Hauptreisezeit sind die Hotels viel günstiger.
Outside the peak travel season, the hotels are much cheaper.
season
'die Saison' and 'die Reisezeit' can both mean a period of the year. But 'Saison' is broader: it is about a time when a certain activity is typical, for example in sports, tourism, or culture. 'Reisezeit' can mean two things: the duration of a journey or the period when many people travel. That is why the word can easily be confused. If you are talking about vacations in summer or winter, both can fit. If you mean how long it takes to get from one place to another, only 'Reisezeit' fits.

Mit dem Zug beträgt die Reisezeit nach Hamburg etwa zwei Stunden.
By train, the travel time to Hamburg is about two hours.
In der Saison sind die Hotels am Meer fast immer ausgebucht.
During the season, the hotels by the sea are almost always fully booked.