As the number of users increases, slower connections get congested. The latter are sometimes known as fractional T-1. One T-1 connection should be able to handle at least 200 modems. Evaluate your own needs. Thirty hours may seem like a lot but could easily be used up with two evenings a week spent online.
Modem speed is also a factor here.
With a slower modem or modem pool, it may take several minutes to download a web page or an e-mail message. The essential pieces of equipment for accessing the Internet or a commercial service are a computer, a modem, and a phone line. When choosing a modem, purchase one that offers the highest speed that you can comfortably afford, especially for graphics-intensive applications like navigating the World Wide Web. Buy a 28,800 bps V.34 modem if you can, but don't go any slower than a 14,400 bps V.32 bis modem. External modems are recommended because the LED displays on the front are helpful in diagnosing problems.