Two-thirds (66%) said they were available 24 hours a day, 7 days a week, with only 4% of respondents stating they had set times during which they could be contacted by constituents.
Dywedodd dwy ran o dair (66%) eu bod ar gael 24 awr y dydd, saith niwrnod yr wythnos, a dim ond 4% o'r ymatebwyr a nododd fod ganddynt amseroedd penodedig pan allai etholwyr gysylltu â hwy.