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The router doesn't really care about number of uses, but it cares about the volume of traffic. Of course, more users generate more traffic, but it really depends on how much traffic your 300 users would generate.
Again, as the attachment shows, Cisco recommends the 1941 for up to 25 Mbps of "WAN" bandwidth. If you don't exceed 25 Mbps, it doesn't much matter if you have 3 users, 30 users, 300 user, 3,000 users.
However, even bandwidth capacity isn't hard number, as study of the my prior attachment shows. Actual router performance depends on the kind of traffic and your configuration. Cisco's 25 Mbps is a "safe" recommendation, i.e. it's unlikely you'll have performance issues if you stay under that, but higher volume is possible. With 80 Mbps you might be fine, but you might not too.
Regarding my note about LAN, a 1941 is a router that could also be used for just LAN routing. But if you're using a LAN with more than 10 Mbps Ethernet, it's easier to then exceed the 25 Mbps bandwidth recommendation.
