How do I sync a timer bar with a set time

I have been trying to figure out how to fill a 100 pixel bar in 2 seconds and have it reset to 0 and start again. I can almost get it but the time seems a little off. I also want to be able to adjust the time later with achievements. I am making an idle game and every 2 seconds money is added to my total money. With achievements it should be able to cut the 2 seconds in half and become every 1 second. The only info i found on the forums helped but didn't explain how they came up with the answer they did. if i didn't explain myself well enough just ask and i'll try again to get my question across.

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wow so simple compared to all the crap i was trying. thanks

..no problemo..

..you can change Var_period whenever you want...

I do have 1 question and maybe you'll see it too. On each achievement it should lower the time to fill bar to half of var_period. When i change var_period more than 2 times or so the bar doesn't seem to fill any faster. Question is, can I use a variable to raise the +1 that sets sprite.width and still use var_period? or would that throw the sync off?

you can use Var_period like this..

thanks again you've taught me a lot