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How long should I wait before accepting an unconditional offer?

Hi all, I've been accepted by Kingston University for the course - Information Systems MSc. I'm a non EU student, and the agent who helped me says that I should secure my seat at the earliest like in a couple of days, by paying the university a non-refundable amount of £1000.

I know the agent may earn his commission, but he also says that we have to act fast and confirm the admission before it's too late and it gets occupied by others.

Can anyone tell me how long I should wait to accept the offer? A week, or two weeks? Does anyone have similar experience?