Once you hit the “Chopping” stage, your Balance will be updated every 15 minutes. However, you will not necessarily earn Salad Balance during each interval. It's possible that you will experience several time blocks where Salad is Chopping away fine, but you earn zero Balance. Fear not, as despite the irregularity, your average earnings should be close to the expected earning daily/hourly earning rate for your GPU.
Your earning frequency is dependent on Share Tracking - the mechanic behind crypto mining payouts. While your computer is hashing for six hours straight, you may not find any shares during a payout period due to the luck involved with Cryptomining. Simply continue Chopping, and you should continue to earn balance during the next payouts.