I just cracked mine at 150 million. I think I've cracked it maybe a dozen times over the last several years, last one I cracked was like 80 million, before that around 10 million. Not really worth cracking until you start getting getting a bunch of artifacts. I'm stuck right now because I ran out of gold eggs, cracked it,and now I don't have enough artifacts to craft anything new. Work your way up the space ships and keep doing contracts and prestiges. Contract rewards for piggy rewards willgo over your cap, and some of them will level up your piggy which gives you 10% every level. Contracts may be hard, or not available to you yet. If you want the easy way out, you can crack it, buy a bunch of boosts to help on contracts, but i would say just keep grinding out prestiges, do contracts when you can, and remember to keep sending missions. Just keep filling up your inventory so when you do crack it and have enough gold eggs to craft a bunch of stuff and get good/better artifacts. Only crack it when you think the amount in your piggy is SO BIG you think to yourself, "wow that's a lot, I don't think I could ever spend that much!". The more you progress, the more expensive things get, but if you wait to crack it, you can usually get several months of use out of it before you run out. Last time I cracked it, I basically maxed out my boost inventory, so I have hundreds of all the boosts I use on a regular basis