Two answers.
Number of services: There are 3 services each day (morning, afternoon, and evening) with additional services following, without interruption, the morning service on Shabat and holidays.
Going to synagogue: Observant Jews will try to go to synagogue twice-a-day every day (14 times-a-week); the evening service follows the afternoon service (usually after a brief instructional period) so the person does not leave the synagogue. Put another way, once in the morning and once in the afternoon/evening.
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Jews attend scheduled services. In addition, many synagogues conduct social, cultural, and educational events.
Concerning only the scheduled services:
Some Jews attend synagogue regularly, for the full schedule of services, meaning morning and evening of every day.
Some Jews attend the synagogue service only on Sabbath and holidays ... Friday night, Saturday morning, Saturday evening, holiday morning and evening.
Some Jews attend an occasional Sabbath service and perhaps an occasional holiday service.
Some Jews attend only High Holy Day services ... Rosh Hashana and Yom Kippur.
A great proportion of Jews 'visit' a synagogue only to attend scheduled services, although almost every synagogue conducts social, cultural, and educational events in addition to worship. Concerning only the scheduled services: -- Some Jews attend a synagogue regularly, for the full schedule of services, meaning morning and evening of every day. -- Some Jews attend the synagogue service on Sabbath and holidays ... Friday night, Saturday morning, Saturday evening, holiday morning and evening. -- Some Jews attend an occasional Sabbath service and perhaps an occasional holiday service. -- Some Jews attend only High Holy Day services ... Rosh Hashana and Yom Kippur. -- Some Jews are found at any activity of the synagogue ... worship or communal ... between seldom and never.
Synagogues are used differently depending on the location. Some are used at least three times each day for prayer, others are only used on specific holidays.