My team scheduled a Siege however the time was not during my active playtime, so I decided to keep my troops in the SH to make sure I participate anyways. 

My question is the only issue here is Boosts, if I use 500% offense boost on the troops before sending them in the SH, will it last after the boost timer runs out? 

I am wondering if it works similar to the troop number boost since this one maintains the big number of troops in the SH even after the boost runs out.