Spend money to avoid waiting for a timer to expire.
"The main game mode, non-ironman, allows you to buy bonds to exchange for money and thus skip a good chunk of the grind"
"There are two items to purchase, at least in the Android version. A permanent ad skip, valued at around $5, and an ad skip + unlock all basic items (cars), valued at $10. These purchases are one-time and do not need to be replenished. At most, a customer might spend $15 on the game as a whole if purchasing both items for whatever reason."
"Skip waiting days for planet / tech upgrade / research, buyable ingame resources to be able to perform actions"