scale of image increase over time

[durf]

Hello,

I am looking for a way to scale something over time. Like if I have and object scaled at 0.05 and I have a time limit of 30 seconds. Whats a good way to scale that object to 0.1?

IE object scale is 0.05 at 0 seconds --> objects scale is .075 after 15 seconds ---> objects scale is .1 at 30 seconds.

Thanks