One way to cheat time is by taking a deep sleep. 
 In this pleasant enjoyable sci fi Heinlein takes us through the first person narrative of a brilliant engineer, who is more like Cisco Ramone, the 'I know it all' Flash guy. I personally found this loosely written at parts mostly coz of the creepy romance and heavily amiable people around the protagonist. 
 Time Travel was the reason I picked this book up and far past half the book I was convinced that the only time jump is the Suspended Animation which is dealt in its depth. And when real Time Travel mumbo jumbo kicked in, It had me so excited that I wanted to post that Steve Carrel 'thank you gif' somewhere in that page. From there along this book was a tease, tempting oneself to think of the possible ways towards the predetermined outcome. There were times where I kind of related myself to the protagonist, being a Mechanical Engineer and there were times I found the explanations quite retro. Nevertheless, this one is a fun read, the kind that would make you happy. 
 All If you can ignore the super creepy romance. Also prior reading of By his Bootstraps might enhance the reading experience a tad.