Is it possible to record soundscape continuously for few hours by AudioMoth?
Yes, you can make recordings up to 24 hours in length by setting a single recording period and setting the 'recording length' to the length of the time period. The next version of the configuration app will make this a little easier to do..
If you record at 48kHz you'll generate about 8GB per day and good AA batteries will last about 10 days.
Had a look back on the forum, and it seems the answer is yes - set the period to the time you want to record and the length of recording to number of hours in seconds (2hrs = 7200seconds) - my understanding is the battery life is managed by the processor being asleep when not recording, so I suspect the battery life might be affected.