Latin translation required

[Sparky]

Could anyone translate the following into a snappy phrase in Latin?

"There is never enough time to do a job properly, but there is always enough to do it twice."

[ann_h]

senatus urbe opus fecit

hehe

[ann_h]

Yes I know the endings are wrong, but it's still funny.

[moppettshow]

"Numquam tempus satis opus decenter, sed semper bis, facere"

I have omitted the main verb 'est', which is common in Latin.