Welcome to TVPaint Community forums !

To double the duration of your animation you could use +1 in the handy panel so when your animation is on ones this will set it on doubles.
however if there are holds in it those will only be lengthened by 1 frame.

To my mind it would be very useful to have a X2 button in the handypanel which will double all instance lengths no matter its current value.
so after clicking it those instances with 1 exposure get 2
those with 2 exposures get 4
those with 3 get 6 etc...

Hey! I made a button for that

http://forum.tvpaint.com/viewtopic.php? ... 845#p91507" onclick="window.open(this.href);return false;

Thats Great!

Lets put it in the Handy panel then

ok done?

You know that you can copy paste Nathan's button into the Handy custom panel, right ?

Ah yes i'll do that. (i overlooked the link.)

Still it would be good if the Handy Panel gets it implanted officially from you.