As a sitter, I usually ask when I arrive how often the homeowners would like pics, updates. I say I will be in touch before bedtime and then again in the morning to let them know how the evening went. After that, I usually send them pics once or twice per day. We did a local sit twice for homeowners and in one of their reviews of another sitter, they said this sitter was the best they’d ever had as they sent more photos/videos than any other sitter(s) sent. I never applied for that sit again as I don’t want to be pressured into constantly sending photos - I want to enjoy the sit as well 
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Haven’t experienced anything more than once per day, which even have been rare too, especially in terms of hosts with cats. The time difference between where they’re going also matters a great deal